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== | The '''thermal design power''' ('''TDP'''), sometimes called '''thermal design point''', refers to the maximum amount of [[heat]] generated by the [[CPU]], which the [[computer cooling|cooling system]] in a computer is required to [[dissipation|dissipate]].<ref>{{cite web | ||
| url = http://www.silentpcreview.com/article169-page3.html | |||
| title = Athlon 64 for Quiet Power | page = 3 | |||
| date = 2004-06-15 | accessdate = 2013-12-21 | |||
| author = Mike Chin | publisher = silentpcreview.com | |||
| quote = Thermal Design Power (TDP) should be used for processor thermal solution design targets. The TDP is not the maximum power that the processor can dissipate. | |||
}}</ref> | |||
The TDP is typically not the largest amount of heat the CPU could ever generate, such as by running a [[power virus]], but rather the maximum amount of heat that it would generate when running "real [[application software|applications]]." This ensures the computer will be able to handle essentially all applications without exceeding its thermal envelope, or requiring a cooling system for the maximum theoretical power (which would cost more but in favor of extra headroom for processing power).<ref>{{cite web | |||
| url = http://arstechnica.com/gadgets/2013/01/the-technical-details-behind-intels-7-watt-ivy-bridge-cpus/ | |||
| title = The technical details behind Intel's 7 Watt Ivy Bridge CPUs | |||
| date = 2013-01-14 | accessdate = 2013-01-14 | |||
| publisher = arstechnica.com | |||
| quote = In Intel's case, a specified chip's TDP has less to do with the amount of power a chip needs to use (or can use) and more to do with the amount of power the computer's fan and heatsink need to be able to dissipate while the chip is under sustained load. Actual power usage can be higher or (much) lower than TDP, but the figure is intended to give guidance to engineers designing cooling solutions for their products. | |||
}}</ref> | |||
== | == Overview == | ||
In some cases the TDP has been underestimated such that in real applications (typically strenuous, such as video encoding or games) the CPU exceeds the TDP, overloading the computer's cooling system. In this case, the CPU will either cause a system failure (a "therm-trip") or throttle its speed down.<ref>{{cite web | |||
| url = http://ixbtlabs.com/articles2/p4-throttling/ | |||
| title = Testing Thermal Throttling in Pentium 4 CPUs with Northwood and Prescott cores | |||
| date = 2004-03-26 | accessdate = 2013-12-21 | |||
| author = Stanislav Garmatyuk | publisher = ixbtlabs.com | |||
}}</ref> Most modern processors will only cause a therm-trip on a catastrophic cooling failure, such as a stuck fan or a loose heatsink. | |||
For example, a [[laptop]]'s CPU cooling system may be designed for a 20 [[Watt|W]] TDP, which means that it can dissipate up to 20 watts of heat without exceeding the maximum [[junction temperature]] for the laptop's CPU. A cooling system can do this using an active cooling method (e.g. forced convection) such as a [[Computer fan|fan]], or any of the three passive cooling methods: [[convection]], [[thermal radiation]] or [[Conduction (heat)|conduction]]. Typically, a combination of these methods is used. | |||
Since safety margins and the definition of what constitutes a real application vary among [[Integrated device manufacturer|manufacturers]], TDP values between different manufacturers cannot be accurately compared. For example, while a processor with a TDP of 100 W will almost certainly use more [[electric power|power]] at full load than a processor with a 10 W TDP from the same manufacturer, it may or may not use more power than a processor from a different manufacturer that has a 90 W TDP. Additionally, TDPs are often specified for families of processors, with the low-end models usually using significantly less power than those at the high end of the family. | |||
The dynamic power consumed by a switching circuit is approximately proportional to the square of the voltage:<ref>{{cite web | |||
| url = ftp://download.intel.com/design/network/papers/30117401.pdf | |||
| title = Enhanced Intel SpeedStep Technology for the Intel Pentium M Processor (White Paper) | |||
| date = March 2004 | accessdate = 2013-12-21 | |||
| publisher = [[Intel Corporation]] | format = PDF | |||
}}</ref> | |||
:<math>P = C V^2 f</math> | |||
where {{mvar|C}} is capacitance, {{mvar|f}} is frequency, and {{mvar|V}} is voltage. | |||
== | == {{Anchor|VARIABLE|SDP|NDP|CTDP}}Variable TDP == | ||
; Configurable TDP (cTDP) | |||
: ''cTDP'' (also known as ''programmable TDP'') is an operating mode of later generations of [[Intel]]'s mobile processors ({{As of|2014|January|lc=yes}}), allowing adjustments in their TDP values. By modifying the processor behavior and its performance levels, power consumption of a processor can be changed altering its TDP at the same time. That way, a processor can operate at higher or lower performance levels, depending on the available cooling capacities.<ref name="intel-mh-lines">{{cite web | |||
| url = http://www.intel.com/content/dam/www/public/us/en/documents/datasheets/4th-gen-core-family-mobile-m-h-processor-lines-vol-1-datasheet.pdf | |||
| title = 4th Generation Intel Core processor based on Mobile M-Processor and H-Processor Lines Datasheet, Volume 1 of 2 | |||
| date = December 2013 | accessdate = 2013-12-22 | |||
| publisher = intel.com | format = PDF | |||
| quote = Configurable TDP (cTDP) and Low-Power Mode (LPM) form a design vector where the processor behavior and package TDP are dynamically adjusted to a desired system performance and power envelope. [...] With cTDP, the processor is now capable of altering the maximum sustained power with an alternate guaranteed frequency. Configurable TDP allows operation in situations where extra cooling is available or situations where a cooler and quieter mode of operation is desired.}}</ref>{{rp|69–72}} | |||
: With cTDP, three operating modes are available:<ref name="intel-mh-lines" />{{rp|71–72}} | |||
:* ''Nominal TDP''{{snd}} this is the processor's rated frequency and TDP. | |||
:* ''cTDP down''{{snd}} when a cooler or quieter mode of operation is desired, this mode specifies a lower TDP and lower guaranteed frequency versus the nominal mode. | |||
:* ''cTDP up''{{snd}} when extra cooling is available, this mode specifies a higher TDP and higher guaranteed frequency versus the nominal mode. | |||
: For example, some of the [[Haswell (microarchitecture)#MOBILE|mobile Haswell]] processors support cTDP up, cTDP down, or both. | |||
; Scenario Design Power (SDP) | |||
: ''SDP'' is an operating mode of certain later generations of Intel's mobile processors ({{As of|2014|January|lc=yes}}), allowing them to work at much lower power levels when compared to similar mobile processors not featuring the SDP. They can still exceed SDP and operate at higher power levels under certain workloads and with appropriate cooling capacities provided; for example, they can reach TDP power levels.<ref>{{cite web | |||
| url = http://arstechnica.com/gadgets/2013/01/the-technical-details-behind-intels-7-watt-ivy-bridge-cpus/ | |||
| title = The technical details behind Intel's 7 Watt Ivy Bridge CPUs | |||
| date = 2013-01-14 | accessdate = 2013-12-22 | |||
| publisher = arstechnica.com | |||
| quote = If the CPU needs to work hard for an extended period of time and the laptop gets warmer, it will slowly ramp down its speed until it's operating at its stated TDP. [...] There are two OEM-configurable "power level" states that define how quick the CPU can be in these situations: PL2 tells the processor how much power it's allowed to use when it needs a short burst of speed, and PL1 defines how quickly the processor can run under sustained load. [...] This is at the heart of what Intel is doing with the Y-series processors: their maximum TDP has been lowered four watts, from 17 to 13. Intel is also validating them for use at two lower PL1 values: 10 watts and 7 watts. This is where the marketing we discussed earlier comes in—rather than keeping these values under the covers as it has so far been content to do, Intel has taken that lowest value, put it on its product pages, and called it SDP. | |||
}}</ref><ref>{{cite web | |||
| url = http://www.intel.com/content/dam/www/public/us/en/documents/datasheets/4th-gen-core-family-mobile-u-y-processor-lines-vol-1-datasheet.pdf | |||
| title = 4th Generation Intel Core processor based on Mobile U-Processor and Y-Processor Lines Datasheet, Volume 1 of 2 | |||
| date = December 2013 | accessdate = 2013-12-22 | |||
| publisher = intel.com | format = PDF | |||
}}</ref>{{rp|71}} | |||
: For example, [[Haswell (microarchitecture)#MOBILE|Y-series]] (extreme-low power) mobile Haswell processors support SDP. | |||
== See also == | |||
* [[CPU power dissipation]] | |||
* [[Operating temperature]] | |||
== | == References == | ||
{{Reflist|30em}} | |||
{{DEFAULTSORT:Thermal Design Power}} | |||
[[Category:Computer engineering]] | |||
Revision as of 20:45, 23 April 2013
The thermal design power (TDP), sometimes called thermal design point, refers to the maximum amount of heat generated by the CPU, which the cooling system in a computer is required to dissipate.[1]
The TDP is typically not the largest amount of heat the CPU could ever generate, such as by running a power virus, but rather the maximum amount of heat that it would generate when running "real applications." This ensures the computer will be able to handle essentially all applications without exceeding its thermal envelope, or requiring a cooling system for the maximum theoretical power (which would cost more but in favor of extra headroom for processing power).[2]
Overview
In some cases the TDP has been underestimated such that in real applications (typically strenuous, such as video encoding or games) the CPU exceeds the TDP, overloading the computer's cooling system. In this case, the CPU will either cause a system failure (a "therm-trip") or throttle its speed down.[3] Most modern processors will only cause a therm-trip on a catastrophic cooling failure, such as a stuck fan or a loose heatsink.
For example, a laptop's CPU cooling system may be designed for a 20 W TDP, which means that it can dissipate up to 20 watts of heat without exceeding the maximum junction temperature for the laptop's CPU. A cooling system can do this using an active cooling method (e.g. forced convection) such as a fan, or any of the three passive cooling methods: convection, thermal radiation or conduction. Typically, a combination of these methods is used.
Since safety margins and the definition of what constitutes a real application vary among manufacturers, TDP values between different manufacturers cannot be accurately compared. For example, while a processor with a TDP of 100 W will almost certainly use more power at full load than a processor with a 10 W TDP from the same manufacturer, it may or may not use more power than a processor from a different manufacturer that has a 90 W TDP. Additionally, TDPs are often specified for families of processors, with the low-end models usually using significantly less power than those at the high end of the family.
The dynamic power consumed by a switching circuit is approximately proportional to the square of the voltage:[4]
where Template:Mvar is capacitance, Template:Mvar is frequency, and Template:Mvar is voltage.
Variable TDP
- Configurable TDP (cTDP)
- cTDP (also known as programmable TDP) is an operating mode of later generations of Intel's mobile processors (Template:As of), allowing adjustments in their TDP values. By modifying the processor behavior and its performance levels, power consumption of a processor can be changed altering its TDP at the same time. That way, a processor can operate at higher or lower performance levels, depending on the available cooling capacities.[5]Primarily based on the most recent URA personal property value index (PPPI) flash estimates, we know that the PPPI, which represents the overall real property price development, has dipped in 2013Q4. That is the first dip the market has seen within the final 2 years.
To give you some perspective, the entire number of personal properties in Singapore (together with govt condominiums) is 297,689 in 2013Q3. Primarily based on the projection that there will be 19,302 units accomplished in 2014, the rise in residential models works out to be more than 6%. With a lot New Ec Launch Singapore provide, buyers might be spoilt for alternative and this in flip will lead to their reluctance to pay a premium for potential models. The complete textual content of the Copyright Act (Cap sixty three) and different statutes regarding IPR might be found on the Singapore Statutes Online Website online The Group's income jumped forty.1 p.c to $324.5 million from $231.6 million in FY 2013, lifted by increased development income and sales of growth properties in Singapore and China. Actual Estate Shopping for
One factor we've on this nation is a big group of "economists," and "market analysts." What's interesting about this group of real property market-watchers is that there are two very other ways wherein they predict Boomers will affect housing markets over the subsequent decade. Let's check out those two opposites and see how every can change the best way real property investors strategy their markets. The good news is that actual property buyers are prepared for either state of affairs, and there's profit in being ready. I'm excited and searching ahead to the alternatives both or each of these conditions will supply; thank you Boomers! Mapletree to further broaden past Asia Why fortune will favour the brave in Asia's closing real property frontier
The story of the 23.2 home begins with a stack of Douglas fir beams salvaged from varied demolished warehouses owned by the consumer's household for a number of generations. Design and structure innovator Omer Arbel, configured them to type a triangulated roof, which makes up one of the placing features of the home. The transient from the entrepreneur-proprietor was not solely to design a house that integrates antique wood beams, however one which erases the excellence between inside and exterior. Built on a gentle slope on a large rural acreage surrounded by two masses of previous-development forests, the indoors movement seamlessly to the outdoors and, from the within looking, one enjoys unobstructed views of the existing natural panorama which is preserved
First, there are typically extra rental transactions than gross sales transactions, to permit AV to be decided for each property primarily based on comparable properties. Second, movements in sale costs are more unstable than leases. Hence, utilizing rental transactions to derive the AV helps to maintain property tax more steady for property homeowners. If you're buying or trying to lease a property. It's tiring to call up individual property agent, organize appointments, coordinate timing and to go for particular person property viewing. What most individuals do is to have a property agent representing them who will arrange and coordinate the viewings for all the properties out there based mostly on your necessities & most well-liked timing. Rent Property District 12 Rent Property District thirteen
The Annual Worth of a property is mostly derived based mostly on the estimated annual hire that it may well fetch if it have been rented out. In determining the Annual Worth of a property, IRAS will think about the leases of similar properties within the vicinity, dimension and condition of the property, and different relevant components. The Annual Worth of a property is determined in the identical method regardless of whether the property is let-out, proprietor-occupied or vacant. The Annual Worth of land is determined at 5% of the market price of the land. When a constructing is demolished, the Annual Worth of the land is assessed by this method. Property Tax on Residential Properties Buyer Stamp Responsibility on Buy of Properties – Business and residential properties Rent House District 01
Within the event the Bank's valuation is decrease than the acquisition price, the purchaser has to pay the distinction between the purchase value and the Bank's valuation utilizing money. As such, the money required up-front might be increased so it's at all times essential to know the valuation of the property before making any offer. Appoint Lawyer The Bank will prepare for a proper valuation of the property by way of physical inspection The completion statement will present you the balance of the acquisition price that you must pay after deducting any deposit, pro-rated property tax and utility costs, upkeep prices, and different relevant expenses in addition to any fees payable to the agent and the lawyer. Stamp Responsibility Primarily based on the Purchase Price or Market Value, whichever is larger
- With cTDP, three operating modes are available:[5]Primarily based on the most recent URA personal property value index (PPPI) flash estimates, we know that the PPPI, which represents the overall real property price development, has dipped in 2013Q4. That is the first dip the market has seen within the final 2 years.
To give you some perspective, the entire number of personal properties in Singapore (together with govt condominiums) is 297,689 in 2013Q3. Primarily based on the projection that there will be 19,302 units accomplished in 2014, the rise in residential models works out to be more than 6%. With a lot New Ec Launch Singapore provide, buyers might be spoilt for alternative and this in flip will lead to their reluctance to pay a premium for potential models. The complete textual content of the Copyright Act (Cap sixty three) and different statutes regarding IPR might be found on the Singapore Statutes Online Website online The Group's income jumped forty.1 p.c to $324.5 million from $231.6 million in FY 2013, lifted by increased development income and sales of growth properties in Singapore and China. Actual Estate Shopping for
One factor we've on this nation is a big group of "economists," and "market analysts." What's interesting about this group of real property market-watchers is that there are two very other ways wherein they predict Boomers will affect housing markets over the subsequent decade. Let's check out those two opposites and see how every can change the best way real property investors strategy their markets. The good news is that actual property buyers are prepared for either state of affairs, and there's profit in being ready. I'm excited and searching ahead to the alternatives both or each of these conditions will supply; thank you Boomers! Mapletree to further broaden past Asia Why fortune will favour the brave in Asia's closing real property frontier
The story of the 23.2 home begins with a stack of Douglas fir beams salvaged from varied demolished warehouses owned by the consumer's household for a number of generations. Design and structure innovator Omer Arbel, configured them to type a triangulated roof, which makes up one of the placing features of the home. The transient from the entrepreneur-proprietor was not solely to design a house that integrates antique wood beams, however one which erases the excellence between inside and exterior. Built on a gentle slope on a large rural acreage surrounded by two masses of previous-development forests, the indoors movement seamlessly to the outdoors and, from the within looking, one enjoys unobstructed views of the existing natural panorama which is preserved
First, there are typically extra rental transactions than gross sales transactions, to permit AV to be decided for each property primarily based on comparable properties. Second, movements in sale costs are more unstable than leases. Hence, utilizing rental transactions to derive the AV helps to maintain property tax more steady for property homeowners. If you're buying or trying to lease a property. It's tiring to call up individual property agent, organize appointments, coordinate timing and to go for particular person property viewing. What most individuals do is to have a property agent representing them who will arrange and coordinate the viewings for all the properties out there based mostly on your necessities & most well-liked timing. Rent Property District 12 Rent Property District thirteen
The Annual Worth of a property is mostly derived based mostly on the estimated annual hire that it may well fetch if it have been rented out. In determining the Annual Worth of a property, IRAS will think about the leases of similar properties within the vicinity, dimension and condition of the property, and different relevant components. The Annual Worth of a property is determined in the identical method regardless of whether the property is let-out, proprietor-occupied or vacant. The Annual Worth of land is determined at 5% of the market price of the land. When a constructing is demolished, the Annual Worth of the land is assessed by this method. Property Tax on Residential Properties Buyer Stamp Responsibility on Buy of Properties – Business and residential properties Rent House District 01
Within the event the Bank's valuation is decrease than the acquisition price, the purchaser has to pay the distinction between the purchase value and the Bank's valuation utilizing money. As such, the money required up-front might be increased so it's at all times essential to know the valuation of the property before making any offer. Appoint Lawyer The Bank will prepare for a proper valuation of the property by way of physical inspection The completion statement will present you the balance of the acquisition price that you must pay after deducting any deposit, pro-rated property tax and utility costs, upkeep prices, and different relevant expenses in addition to any fees payable to the agent and the lawyer. Stamp Responsibility Primarily based on the Purchase Price or Market Value, whichever is larger- Nominal TDPTemplate:Snd this is the processor's rated frequency and TDP.
- cTDP downTemplate:Snd when a cooler or quieter mode of operation is desired, this mode specifies a lower TDP and lower guaranteed frequency versus the nominal mode.
- cTDP upTemplate:Snd when extra cooling is available, this mode specifies a higher TDP and higher guaranteed frequency versus the nominal mode.
- For example, some of the mobile Haswell processors support cTDP up, cTDP down, or both.
- Scenario Design Power (SDP)
- SDP is an operating mode of certain later generations of Intel's mobile processors (Template:As of), allowing them to work at much lower power levels when compared to similar mobile processors not featuring the SDP. They can still exceed SDP and operate at higher power levels under certain workloads and with appropriate cooling capacities provided; for example, they can reach TDP power levels.[6][7]Primarily based on the most recent URA personal property value index (PPPI) flash estimates, we know that the PPPI, which represents the overall real property price development, has dipped in 2013Q4. That is the first dip the market has seen within the final 2 years.
To give you some perspective, the entire number of personal properties in Singapore (together with govt condominiums) is 297,689 in 2013Q3. Primarily based on the projection that there will be 19,302 units accomplished in 2014, the rise in residential models works out to be more than 6%. With a lot New Ec Launch Singapore provide, buyers might be spoilt for alternative and this in flip will lead to their reluctance to pay a premium for potential models. The complete textual content of the Copyright Act (Cap sixty three) and different statutes regarding IPR might be found on the Singapore Statutes Online Website online The Group's income jumped forty.1 p.c to $324.5 million from $231.6 million in FY 2013, lifted by increased development income and sales of growth properties in Singapore and China. Actual Estate Shopping for
One factor we've on this nation is a big group of "economists," and "market analysts." What's interesting about this group of real property market-watchers is that there are two very other ways wherein they predict Boomers will affect housing markets over the subsequent decade. Let's check out those two opposites and see how every can change the best way real property investors strategy their markets. The good news is that actual property buyers are prepared for either state of affairs, and there's profit in being ready. I'm excited and searching ahead to the alternatives both or each of these conditions will supply; thank you Boomers! Mapletree to further broaden past Asia Why fortune will favour the brave in Asia's closing real property frontier
The story of the 23.2 home begins with a stack of Douglas fir beams salvaged from varied demolished warehouses owned by the consumer's household for a number of generations. Design and structure innovator Omer Arbel, configured them to type a triangulated roof, which makes up one of the placing features of the home. The transient from the entrepreneur-proprietor was not solely to design a house that integrates antique wood beams, however one which erases the excellence between inside and exterior. Built on a gentle slope on a large rural acreage surrounded by two masses of previous-development forests, the indoors movement seamlessly to the outdoors and, from the within looking, one enjoys unobstructed views of the existing natural panorama which is preserved
First, there are typically extra rental transactions than gross sales transactions, to permit AV to be decided for each property primarily based on comparable properties. Second, movements in sale costs are more unstable than leases. Hence, utilizing rental transactions to derive the AV helps to maintain property tax more steady for property homeowners. If you're buying or trying to lease a property. It's tiring to call up individual property agent, organize appointments, coordinate timing and to go for particular person property viewing. What most individuals do is to have a property agent representing them who will arrange and coordinate the viewings for all the properties out there based mostly on your necessities & most well-liked timing. Rent Property District 12 Rent Property District thirteen
The Annual Worth of a property is mostly derived based mostly on the estimated annual hire that it may well fetch if it have been rented out. In determining the Annual Worth of a property, IRAS will think about the leases of similar properties within the vicinity, dimension and condition of the property, and different relevant components. The Annual Worth of a property is determined in the identical method regardless of whether the property is let-out, proprietor-occupied or vacant. The Annual Worth of land is determined at 5% of the market price of the land. When a constructing is demolished, the Annual Worth of the land is assessed by this method. Property Tax on Residential Properties Buyer Stamp Responsibility on Buy of Properties – Business and residential properties Rent House District 01
Within the event the Bank's valuation is decrease than the acquisition price, the purchaser has to pay the distinction between the purchase value and the Bank's valuation utilizing money. As such, the money required up-front might be increased so it's at all times essential to know the valuation of the property before making any offer. Appoint Lawyer The Bank will prepare for a proper valuation of the property by way of physical inspection The completion statement will present you the balance of the acquisition price that you must pay after deducting any deposit, pro-rated property tax and utility costs, upkeep prices, and different relevant expenses in addition to any fees payable to the agent and the lawyer. Stamp Responsibility Primarily based on the Purchase Price or Market Value, whichever is larger
- For example, Y-series (extreme-low power) mobile Haswell processors support SDP.
See also
References
43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.