GPU Suddenly Very Hot After New CPU Heatsink/Fan Install

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NeuroBass

Commendable
Jul 13, 2016
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Hello, I was recently having issues with my CPU running pretty warm while gaming (around 60-70 degrees C), so I got a Cryorig H7 Tower Cooler Heatsink and last night after installation I began to game, after about 30 minutes I check on all my temps and to my joy the CPU was not in the 30-40s range for Degrees C, yay!
However I felt a lot of heat coming from my PC, so I inspected the case and then my temp monitoring program, and my GPU was very hot, going in the mid 70 degrees C! My temperatures were never even above 50 prior to this new heatsink yesterday!
Now the issue with this is; I have a brand new GTX 970 which I purchased 1 month ago , when installing the heatsink it was a fairly simply installation and I did not even touch my GPU, no wires were changed in placing, the only thing that is different inside my PC now is the fact that my new sink is about 2x larger; however my GPU fans blow downwards while my heatsink is above the GPU so to my best guess there should be no effect on my GPU temp from the heatsink, but clearly something happened. No GPU fan settings or anything were changed.
I am a bit of a PC noob so I would love some help so I can return to gaming, as I'm worried that my GPU may become damaged from such high temps.
 
Solution
Shaun o
It`s called thermal Mass.

The way a cpu cooler Neuro deals with keeping a cpu much cooler is by soaking up more heat and spreading it over the larger surface area of the cooler via copper heat pipes in contact with the cpu die and a larger array of aluminium cooling fins, it draws heat away from the contact of the cpu die at a faster more sustained rate.


A larger heat sink will hold more of thermal heat build up.
And try to dissipate it much quicker from the fins of the cpu cooler via a fan.

There is a larger surface area now being heated due to larger size of the cooler.

The other offset side is due to the larger area of the new cooler circulating air is reduced for other components in the system to cool efficiently.

Heat always...
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NeuroBass

Commendable
Jul 13, 2016
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My question is; what has caused this drastic change in temperature, nothing has changed to my GPU, the only difference now is I have a bigger heatsink. Until the heatsink change my GPU did not get this hot at all.
Also, are mid 70 degrees C dangerous temperatures for my GPU?
 
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Shaun o

Shaun o

Illustrious
Oct 7, 2007
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41,960
It`s called thermal Mass.

The way a cpu cooler Neuro deals with keeping a cpu much cooler is by soaking up more heat and spreading it over the larger surface area of the cooler via copper heat pipes in contact with the cpu die and a larger array of aluminium cooling fins, it draws heat away from the contact of the cpu die at a faster more sustained rate.


A larger heat sink will hold more of thermal heat build up.
And try to dissipate it much quicker from the fins of the cpu cooler via a fan.

There is a larger surface area now being heated due to larger size of the cooler.

The other offset side is due to the larger area of the new cooler circulating air is reduced for other components in the system to cool efficiently.

Heat always tries to escape by rising.
But when you put a hot device next to another where it gets hot you have to deal with the radiating effect of the larger surface heated area.
Its like having a house radiator on, you may not be touching the radiator its self, but you can feel the heat coming off it.
Even if you put your hand to the side of it other than the top of it.

If you put a tin can next to the radiator, but it was not touching after a while the facing edge to the radiator would become warm.
Through heat transfer, even if there is an slight air gap.


Adding more fans to the system case if possible, to get air moving helps.
 
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