Why do CPUs benefit so much less from good cooling than GPUs? - Page 2 - Overclock.net - An Overclocking Community

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Why do CPUs benefit so much less from good cooling than GPUs?

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post #11 of 22 (permalink) Old 06-11-2019, 10:17 AM
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I think decent cooling will make a huge difference to the new Ryzen 3 chips. 7nm is so dense.

It makes a big difference to Vega 20 (much bigger difference than 14nm Vega 10).
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post #12 of 22 (permalink) Old 06-11-2019, 01:44 PM - Thread Starter
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Good responses. I appreciate the knowledge. Can anyone give me an answer on whether I should give delidding another go? I suspect I didn't replace the heat spreader quite as well as I could have. Is it worth it or do I just deal with a higher package/core 3 Tmax?

Quote: Originally Posted by deafboy View Post

Direct mount helps though regardless in optimal uses
Can you mount a waterblock directly to a CPU die?

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post #13 of 22 (permalink) Old 06-11-2019, 02:20 PM
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You can direct die a CPU with a water block but you're looking at a 5c difference over what you had with the IHS.
GPUs can usually gain 100 maybe even 200Mhz when you water cool them, the CPU isn't likely to gain much of anything unless you're thermally limited instead of power limited.


Exactly why it's harder to cool a CPU is a bit unclear but there are a few things to note:
CPUs are sold pretty close to max OCs already while GPUs (since Pascal) have the BIOS completely locked down so we can't apply voltage and power the way we can with a CPU, the cards will not apply more power unless you cool them.
A 200w CPU means your CPU alone is pulling 200w while a 300w GPU means the whole board is splitting the power, not all of it is going to the die you're trying to cool.


As always delidding is an effective option and so is researching and getting an AIB card with a good cooler. Beyond that watercooling has almost no value unless you have the best possible GPU and still want a slight bump in perfomance, you're always better off going from a 2080 to a 2080 TI instead of spending even more on a loop.


Cooler is really only "better" if you're chasing higher clocks...otherwise there's nothing wrong with having a CPU that runs in the 80s under stress and a GPU that games in the high 70s. IF you still have a 10-20c delta between you coolest and hottest cores, yeah it might be a good idea to check the delid, there could be too much silicon making a gap or the TIM could be spread poorly.

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The key is generally not which brands are good but which specific products are. Motherboards and GPUs are perfect examples of companies having everything from golden to garbage function/quality.
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post #14 of 22 (permalink) Old 06-12-2019, 12:21 AM - Thread Starter
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Quote: Originally Posted by white owl View Post
you're always better off going from a 2080 to a 2080 TI instead of spending even more on a loop.
While more performance is always nice, I'm quite happy with my 1080. But, more pertinently, my rationale would be that spending $1300 on a loop that would last me many years--with the occasional refill and replacement--would be a better investment than spending $1300 on a card I would likely replace within 5 years. And it would be a fun first time project, I'm sure. But it is disheartening that you can't get sub-60 temps on a fully overclocked CPU.
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post #15 of 22 (permalink) Old 06-12-2019, 01:02 AM
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get a 9X140 rad with noctua leaf blowers in push/pull and you'll be fine.

Remember the golden rule of statistics: A personal sample size of one is a sufficient basis upon which to draw universal conclusions.
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post #16 of 22 (permalink) Old 06-12-2019, 07:17 AM
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I've always had best results by delidding, then lapping the surface on the underside edge of the heatspreader so when you re-install it onto the chip, it sits a little lower and makes better contact. If the newer Intel chips are anything like my 4670k, there is a fairly substantial gap betweeen the core and the IHS. doing this also dropped my CPU temp an additional 15'c on top of the 15-20'c i got before i lapped the IHS.



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post #17 of 22 (permalink) Old 06-12-2019, 02:38 PM
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My old AMD 2500 [email protected] was very happy at watercooling, and no way a air cooler could even match this system.

So i have difficulty to understand this GPU/CPU talk. They are diferent. Period.
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post #18 of 22 (permalink) Old 06-14-2019, 06:15 AM
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A GPU has a much later die, so more heat transfer. And a CPU consumes less power than a GPU. So a CPU is more limited by heat exchanging capacities than by the cooler itself.

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post #19 of 22 (permalink) Old 06-14-2019, 06:42 AM
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Dize size difference, die height difference, direct vs heat spreader cooling, GPUs are often very power limited or don't run at full blast/utilization of all it's parts at the same time, CPUs can burn hard and utilize a lot but again some instructions and loads run hotter than others, sometimes the hottest are simple repetitive loads, Linpack burner, Prime burner, ...

The heat density nowadays is very high on CPUs. Even GPUs.
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post #20 of 22 (permalink) Old 06-19-2019, 05:14 AM
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Quote: Originally Posted by pmc25 View Post
I think decent cooling will make a huge difference to the new Ryzen 3 chips. 7nm is so dense.

It makes a big difference to Vega 20 (much bigger difference than 14nm Vega 10).
If thats true, great. I feel like i didn't benefit much from watercooling my 1600x, only that i wouldn't have been able to run 4.2ghz at low ambient without.

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