Why are gpu temps better than cpu temps?

[homefry]

So some systems have gpus that put out more heat.

Why are load temps better for gpu's than on cpus?

[urgrandpasdog]

Thats a pretty ridiculous generalization, if anything in a standard air cooled system the GPUs get considerably hotter under heavy load.

[Phatboy69]

As your talking in the water cooling forum i presume you mean water cooled CPU vs GPU.

The load temp is better because the GPU chip is bigger as is the waterblock cooling the GPU, so you have more surface contact area for the GPU. ie more heat is removed over a given time due to more time water is in contact with the block.

My CPU runs at 70c compared with 50c for 4 GPUs running in series.

[stephenswiftech]

1/ Greater heat load (sometimes)
2/ Larger die surface (i.e. Smaller Heat Flux - i.e. easier to cool)
3/ Probe location (high gradients of temperature throughout the die surface)
4/ IHS vs no IHS (on AMD at least..)

#2 + #3 make CPU and GPU not really comparable temperature wise

[subtec]

Is it just me or is the question in the title the inverse of the one in the post?

[tiborrr]

subtec: True

[eKirts]

Is it just me or is the question in the title the inverse of the one in the post?

+1

interesting post....

[homefry]

yeah, that was a ridiculous mistake. i've been studying too long.

[homefry]

As your talking in the water cooling forum i presume you mean water cooled CPU vs GPU.

The load temp is better because the GPU chip is bigger as is the waterblock cooling the GPU, so you have more surface contact area for the GPU. ie more heat is removed over a given time due to more time water is in contact with the block.

My CPU runs at 70c compared with 50c for 4 GPUs running in series.

You would think overtime, all your components would stabilize toward the same temp within at least 10C and not a crazy high 20C delta.

Even GPU only blocks the same size as cpu only blocks get better temps, so it doesn't have to do with the size of gpu full cover blocks.

[homefry]

1/ Greater heat load (sometimes)
2/ Larger die surface (i.e. Smaller Heat Flux - i.e. easier to cool)
3/ Probe location (high gradients of temperature throughout the die surface)
4/ IHS vs no IHS (on AMD at least..)

#2 + #3 make CPU and GPU not really comparable temperature wise

1. Some systems with a 5970 and 920 have lower temps on the gpu even though the gpu puts out more heat.
3 This is a non issue because most probes are within the hottest areas.
4. IHS should have a minimal impact. Surely not as much as 20C delta we see in systems.

[tiborrr]

You cannot compare two different sensors, it's like comparing apples to oranges.

[rge]

1. Some systems with a 5970 and 920 have lower temps on the gpu even though the gpu puts out more heat.
3 This is a non issue because most probes are within the hottest areas.
4. IHS should have a minimal impact. Surely not as much as 20C delta we see in systems.

by size of die... referring to power density of cpus are higher. 150W consumed in size of 1 fingerprint it going to have a higher temp gradient than 200W consumed in size of 2 fingerprints. Every time the die shrinks, power density rises, so architectural improvements and smaller v must counterbalance rise.