Why do CPUs heat up much faster than GPUs?

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hedfun2

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Nov 8, 2013
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I have an i5 4690k @ 4.4GHz and a GTX 780 and when I run prime 95 for example my CPU immediately jumps to 60-70C and can randomly spike into the 80s. But when I run an extremely GPU Intesive program whether it be a benchmark or a game, the GPU temperature slowly goes to 70C over the course of like 2 minutes. Why do CPU temperatures fluctuate faster and much more than GPU temperatures?
 
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Most benchmarks/games don't fully tax a GPU, unlike doing something like prime95 for CPU. Try finding some GPU compute benchmarks/stress-tests and see how quickly your GPU heats up. Also, GPUs are larger and thus can have bigger heatsinks/cooling systems that are more effective.
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Gam3r01

Gam3r01

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Jan 12, 2013
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Simply different architecture, and test loads.
Graphics cards have a much larger heatsink that takes some time to heat up before maxing out.

It takes my graphics card ~30 seconds longer to pass 40C compared to my processor, but the processor peaks at 43C where the graphics card goes up to 70.
 
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viewtyjoe

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Jul 28, 2014
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Most benchmarks/games don't fully tax a GPU, unlike doing something like prime95 for CPU. Try finding some GPU compute benchmarks/stress-tests and see how quickly your GPU heats up. Also, GPUs are larger and thus can have bigger heatsinks/cooling systems that are more effective.
 
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Afterdark3

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Dec 3, 2014
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Well, Thats quite an interesting question and it all depends on a couple things, is your CPU on a higher end cooler heat pipe cooler or a stock cooler, and what kind of 780 you have, but usually the CPU heats up quite quickly due to its need to quickly respond to workloads and possibly your thermal paste might be bad, but usually not if your temps don't go too high. And I've also noticed, GPU's, if they have a good cooler, tend to need to warm up and aren't heated up immediately like a CPU is.
 
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