Heat Generation

[Magic Carpet]

With equal cooling and similar vCore provided. Has anybody compared AMD/Intel parts in that respect?

 

[paperwastage]

With equal cooling and similar vCore provided. Has anybody compared AMD/Intel parts in that respect?

equal cooling - easy to test... use the same case and HSF (eg 212+)

vCore - hard... the chips themselves require different levels of vcore, you just can't compare like them number by number

you might want to compare power consumption. Energy in = electricity, electricity used up = converted to all heat energy (or noise or light in the case of your monitor)


anyways, Intel's Sandy Bridge chips run pretty cool, especially if you have a decent HSF and don't overclock

 

[Magic Carpet]

Thanks.

Power consumption is well known and easy to check. However, heat dissipation is something else, I have never really been bothered to question. Maybe I am digging in the wrong direction, I know not, this has just crossed my mind. What's the efficiency of these processors anyway. Hmm.

e.g. I know that my PSU dumps quite a lot of heat under low loads! Wrong parallel you reckon?

 

[Blitz KriegeR]

What you are looking for, at least at stock clocks, is pretty close to what TDP is ("Thermal Design Power").

Now that's a value that granted can be taken with a grain of salt, but still is a well published and acceptably comparable value for your question.

Edit: Yes I'd say bad parallel to a PSU. Since a PSU has a much higher "minimum operational state" than a CPU. For example, even an 850w PSU drawing < 100w still has to have the AC to DC converter and many others bits that are above my engineering understanding powered up and operational. Modern CPUs on the other hand are so well power-gated they can completely shut down unused areas to dramatically cut down power/heat.

 

[Concillian]

Thanks.

Power consumption is well known and easy to check. However, heat dissipation is something else, I have never really been bothered to question. Maybe I am digging in the wrong direction, I know not, this has just crossed my mind. What's the efficiency of these processors anyway. Hmm.

e.g. I know that my PSU dumps quite a lot of heat under low loads! Wrong parallel you reckon?

Power consumption = heat generation if cooling is equal. Since no work is being done (work as defined in a Physics textbook,) heat is the only place for that power to go.

That doesn't mean the chip temperatures will end up the same, that just means that, again by the Physics definition, the same amount of heat is generated if the same amount of power is consumed.

Your PSU generating heat at low power output? How are you measuring heat? I assume temperature?

High temperature is not the same as heat. In this example, your power supply likely reduces fan speed (reducing cooling efficiency) and the result is higher temperature for a given thermal load (heat generation rate). Feeling with your hand is very deceiving, because you primarily feel temperature (which is easily deceived by changing airflow) and not "heat".

 

[Aluvus]

Power consumption is well known and easy to check. However, heat dissipation is something else, I have never really been bothered to question. Maybe I am digging in the wrong direction, I know not, this has just crossed my mind. What's the efficiency of these processors anyway. Hmm.

100% of the power that flows into a CPU is lost as heat. From a simple energy balance, you might conclude that they all have an efficiency of 0%, but of course that's not a very helpful result.

What you are looking for, at least at stock clocks, is pretty close to what TDP is ("Thermal Design Power").

Yes, TDP is essentially an estimate of heat output (and therefore power use). Unfortunately, AMD and Intel quote them in different, incompatible, hard-to-compare ways.

AMD's TDP is an absolute-worst-case measurement. Intel's TDP is a sort of "bad enough you probably won't see worse in practice" estimate. Intel's approach makes some sense; the original purpose of TDP, as the name suggests, is to specify how much thermal power the cooling system should be built to dissipate. It is not really necessary to design the cooling system based on the absolute worst case.

AMD has tried to introduce "ACP" (Average CPU Power) as an estimate more comparable to Intel's TDP. But the two estimates are based on different workloads, so they're still not quite comparable...

 

[Magic Carpet]

100&#37; of the power that flows into a CPU is lost as heat.

In which case, why at equal power consumption, Deneb generates a considerable more amount of heat, compared to Thuban? (That's just a subjective feeling I got after the upgrade, this well may be not correct).

Or otherwise, what makes it run so much cooler? Again, this what made me think of efficiency (watt spent / heat generated). Is it more thermal resistant or something?