CPU Temp jumps up and down

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KyleF01

KyleF01

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Aug 27, 2015
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After loading up the Witcher 3 I watched my temperatures rise.

My GPU (gtx 980) went from 37c steadily increasing (...57c,58c,59c) up to 60c where then the fans kicked in at 41% fan speed and keeps it running at around an even 60c.

Where as my CPU goes from 51c and then jumps to 59c, then back to 53c, back to 60c, etc. It jumps all over the place about 3-8c difference at a time.

It's an i7-4470k slight over clock 1.2v (4.2hz) with an H100i cooler.

After playing the Witcher 3 for an hour my gpu temp is consistent.

My CPU is going from 55c up to 64c and then jumping back and forth 57c to 61c, etc.

Why is this happening?
Anything I can do to fix?
 
Solution
W
I replace my thermal paste every 18 months, although you can wait longer than that to do it. Also, if gaming for long periods of time produces a stale smell in the air, try blowing the dust out of your radiator. I had this problem with my Cooler Master Seidon 120v.

The 4770k does not have the best compound between the cores and the heatspreader, so those temperatures seem fine. If we were talking about the 4790k, then I would tell you to check your voltages. It should be fine.
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weberdarren97

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Aug 10, 2015
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That's nothing to worry about. Most games don't place a constant load on the CPU. There's not much for the CPU to do until a new part of a map needs rendered, some action is triggered (like a building falling), or a new instruction is given. At that point, the CPU completes the instructions (making heat in the process) and then returns to a state of lower load (cooling back down by a few degrees). Playing online multiplayer games increases this fluctuating effect.

That temperature fluctuation is nothing to worry about.
 
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KyleF01

KyleF01

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Aug 27, 2015
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Ah cool that actually makes complete sense.
Thanks for the clear answer.

Also, (since we're here) with an H100i watercooler do my temps seem high?
It's been about low 60s (Fahrenheit) here for the past few days and my room is fairly small (200sq ft).

I bought my computer already built (it was put together for about 1.5-2yrs now) and I'm not sure when or if I need to or should replace the thermal paste?
 
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weberdarren97

Glorious
Aug 10, 2015
8,137
6
45,615
I replace my thermal paste every 18 months, although you can wait longer than that to do it. Also, if gaming for long periods of time produces a stale smell in the air, try blowing the dust out of your radiator. I had this problem with my Cooler Master Seidon 120v.

The 4770k does not have the best compound between the cores and the heatspreader, so those temperatures seem fine. If we were talking about the 4790k, then I would tell you to check your voltages. It should be fine.
 
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Solution
Karadjgne

Karadjgne

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Dec 26, 2012
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1. You have a liquid cooler. It takes on average somewhere around 1/2 hour at a roughly constant temp to raise the liquid temp (not to be confused with cpu temp) to those levels. So your temps are perfectly normal for a cpu under liquid cooling. Yes, you'll see erratic cpu temps as cpu usage changes. You have a 4core, 8 thread cpu, but that doesn't mean all 8 threads are used, in some more cpu oriented areas like explosions and grass etc, you might use 5 threads instead of 3, so raising the cpu temps slightly (unlike liquid temp, cpu temp differences are almost instantaneous)

2. Since the gpu is air cooled, temp changes are also fast, but once the heatsink gets truly warmed up, the changes get slower as the heatsink reaches equilibrium. This too is normal, once hot, you'd need to go from opening credits and very low details to in game mega explosions or spend long minutes on ultra detailed grass to change a gpu's temps much.

It's not broke. Don't need fixing. Your temps are all way under 70/80°, cpu/gpu, so no worries.

At 4.2GHz, you could probably get your vcore voltage down to @1.108 or 1.114 which could drop cpu temps down @5°~10°. 1.2v is a little high for 4.2. My 3770k is sitting currently at 4.6GHZ 1.208v with a Kraken x61. Temps don't go over @52° unless I'm really punishing the cpu.
 
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