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

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post #1 of 22 (permalink) Old 06-11-2019, 05:59 AM - Thread Starter
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Why do CPUs benefit so much less from good cooling than GPUs?

So I'm a bit phobic of high temperatures in my system because I had a couple overheat and essentially become defective back in my prebuilt days. Therefore, now it's "the cooler the better".

Anyway, I delidded my 8700K recently because my 5.0 OC @ 1.35 V was hitting temps of 90+ under stress on all cores. It worked, except not entirely--now one core and the package are still close to 90 while the other cores hover around 70. Should I try reapplying the liquid metal?

Anyway, I'm considering getting into custom water cooling to replace my Noctua U14S and cool my GPU. However, I've heard that it might not make much of a difference at all. Why is it that GPUs can drop from 75 to 40 C under load when you switch from the stock (aftermarket) fan solution to a fully custom loop, while CPUs hardly seem better off? Is it worth the trouble?
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post #2 of 22 (permalink) Old 06-11-2019, 06:07 AM
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Hi,
Usually yes delid is funky is why a core of more will be wonky hotter than others

Water depends just like air cooling depends on room temperature more than anything only a chiller can break this barrier
Both depend a lot on mounting to connect the dots of heat transfer
Delid complicates it because now you have liquid metal and it's spread to deal with instead of pigeon poop or solder in the past and now back to the present in 99..k & x series.

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post #3 of 22 (permalink) Old 06-11-2019, 06:35 AM - Thread Starter
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But why are CPUs specifically harder to cool as well as GPUs? And do you recommend I try delid my CPU again?
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post #4 of 22 (permalink) Old 06-11-2019, 06:59 AM
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Hi,
Can't add much more than I already posted

CPU
i9-9940x With Heatkiller IV Pro and VRM Plexi-Copper water block
Motherboard
ASUS x299 Rampage VI Apex
GPU
Titan Xp with copper Water Block
RAM
Trident Z 3600C16 4x8gb's b-die default timings 16-16-16-36
Hard Drive
Samsung 970 Evo Plus 500gb M.2/ Samsung 850 Pro 256gb for os and 500gb evo for favorite games plus other wd hdd's for data and backup's
Optical Drive
LG Blu-Ray WH16NS40
Power Supply
evga 1200-P2
Cooling
2-280GTX Black Ice Nemesis rads with D5 pump-res combo and D5 top before and after rads.
Case
corsair 450D with added 2nd floor to house radiator on top
Operating System
Win-7 pro & 10 pro Win-7 Primary os.
Monitor
ASUS VG248QE 24" 144Hz
Keyboard
Logitech G910 Orion spectrum
Mouse
Redragon Perdition
Audio
Built in realtek and Insignia 2.0 soundbar HSB318
CPU
i7-5930k with Heatkiller IV Pro Plexi-Copper and koolance vrm water blocks
Motherboard
X99 Sabertooth
GPU
EVGA 1080ti FTW3 with Water block
RAM
Trident-Z 3200C14 4x8gb's b-die default timings 14-14-14-34
Hard Drive
Samsung 970 Evo 500gb M.2/ Samsung 850 Pro 256gb for os and 500gb evo for favorite games plus other wd hdd's for data and backup's
Power Supply
EVGA 1000-P2
Cooling
2-240 GTX Black Ice Nemesis rads/ D5 pump-res combo and D5 top before and after rads.
Case
Corsair 450D with added 2nd floor to house radiator on top
Operating System
Win-7 and 10 pro Win-7 Primary os.
Monitor
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Mouse
Red Dragon Perdition
Audio
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post #5 of 22 (permalink) Old 06-11-2019, 07:05 AM
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Quote: Originally Posted by aabeba View Post
But why are CPUs specifically harder to cool as well as GPUs? And do you recommend I try delid my CPU again?
Switch to AMD and you won't have that problem anymore. Cheap old Intel can't afford to put a decent heatspreader on their CPU's. Sad.

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post #6 of 22 (permalink) Old 06-11-2019, 07:14 AM
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Hi,
Well you would have to specify which gpu not all are created equally
But water blocking a gpu would also cover core/ memory chips/ vrm's under the water block.

Water blocking a cpu only covers the chip
You still have memory and vrm's still on air.

CPU
i9-9940x With Heatkiller IV Pro and VRM Plexi-Copper water block
Motherboard
ASUS x299 Rampage VI Apex
GPU
Titan Xp with copper Water Block
RAM
Trident Z 3600C16 4x8gb's b-die default timings 16-16-16-36
Hard Drive
Samsung 970 Evo Plus 500gb M.2/ Samsung 850 Pro 256gb for os and 500gb evo for favorite games plus other wd hdd's for data and backup's
Optical Drive
LG Blu-Ray WH16NS40
Power Supply
evga 1200-P2
Cooling
2-280GTX Black Ice Nemesis rads with D5 pump-res combo and D5 top before and after rads.
Case
corsair 450D with added 2nd floor to house radiator on top
Operating System
Win-7 pro & 10 pro Win-7 Primary os.
Monitor
ASUS VG248QE 24" 144Hz
Keyboard
Logitech G910 Orion spectrum
Mouse
Redragon Perdition
Audio
Built in realtek and Insignia 2.0 soundbar HSB318
CPU
i7-5930k with Heatkiller IV Pro Plexi-Copper and koolance vrm water blocks
Motherboard
X99 Sabertooth
GPU
EVGA 1080ti FTW3 with Water block
RAM
Trident-Z 3200C14 4x8gb's b-die default timings 14-14-14-34
Hard Drive
Samsung 970 Evo 500gb M.2/ Samsung 850 Pro 256gb for os and 500gb evo for favorite games plus other wd hdd's for data and backup's
Power Supply
EVGA 1000-P2
Cooling
2-240 GTX Black Ice Nemesis rads/ D5 pump-res combo and D5 top before and after rads.
Case
Corsair 450D with added 2nd floor to house radiator on top
Operating System
Win-7 and 10 pro Win-7 Primary os.
Monitor
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Mouse
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Audio
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post #7 of 22 (permalink) Old 06-11-2019, 08:18 AM
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In my opinion there are 2 reason why VGA is responding much better on watercooling then CPU's.
-GPU chip has direct contact to VGA block , while CPU chip is not (there is a cap/heatspreader top on the chip itself)
-CPU has much more voltage then GPU (GPU 1V vs CPU 1,3V or so) so its harder to cool it . If u could reach: lets say 6ghz with only 1V ,ur CPU would be same hot as ur VGA (40-45C)
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post #8 of 22 (permalink) Old 06-11-2019, 08:40 AM
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I'd attribute it to two main things:
- Direct mount vs thermal interface materials used between the die and cooler/IHS

- Heat density - for example the RTX 2080 Ti has a die size of 754 mm^2 while an i9-9900k has a die size of 314 mm^2 (the former being 140% bigger). The GPU draws ~250W under torture while the CPU draws upwards of 160W even at stock settings (which is <60% difference).


Surely there are plenty of other factors, but I reckon these two are the most significant.

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post #9 of 22 (permalink) Old 06-11-2019, 09:27 AM
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Quote:
Direct mount Heat density
BOOM

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 #10 of 22 (permalink) Old 06-11-2019, 10:13 AM
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Quote: Originally Posted by fragamemnon View Post
I'd attribute it to two main things:
- Direct mount vs thermal interface materials used between the die and cooler/IHS

- Heat density - for example the RTX 2080 Ti has a die size of 754 mm^2 while an i9-9900k has a die size of 314 mm^2 (the former being 140% bigger). The GPU draws ~250W under torture while the CPU draws upwards of 160W even at stock settings (which is <60% difference).


Surely there are plenty of other factors, but I reckon these two are the most significant.
Pretty much this, but I'd also go one step further on the heat density part

GPU intensive applications are better at utilizing the "cores" so the workload is more evenly spread across the entire die

CPU applications are in many ways still single core/thread bound and as such the load isn't spread across the entire die but a small portion of it, ergo the heat spreader to begin with.

Direct mount helps though regardless in optimal uses

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