Cpu temp spikes when loaded, gpu creeps up.

Defy Belief

Defy Belief

Defy Belief

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29 Sep 2010
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So I’ve built my loop, all seems decent and kind of in line with what I was expecting although I haven’t overclocked yet.

I have a magicool slim 360 and 280 rad, 3 x nb eloop fans on the 360, 2 x ek vardars on the 280. They’re basically silent which is nice.

When I first built it (window was off) I had idle of about 21-22 for the cpu and gpu, now with the panels on it is around the 30 degree figure, not sure if this is normal or not but it’s a case with lots of space (enthoo luxe) so probably not a lot I can do. Please note my tubing goes behind the rear panel, so I’m a little conscious that a small amount of pressure might be restricting the flow to the cpu? Going to take the rear panel off tonight and just test that theory.

Now, when I run stress tests, the cpu temp will spike almost instantly to about 50 then settle at about 55, it’s a Ryzen 1600af on stock clocks.

When I run a GPUs stress test, it’ll start at about 30 but then creep degree by degree to about 43 and then stay at that figure.

Is this normal for CPU’s to behave in this manor or is it likely I have a mounting issue? Everything was tightened in a cross pattern and seems firm on the block. With how the loop is assembled I think it might be quite difficult for me to slide off the block and reapply :(
 
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Your temps look fine to be honest if you think the tubeing might be restricted take back off case and check what are your temps when doing your normal things like gaming when I had my luxe water cooled I took the front metal panel off so the rad got more air passing through it
 
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alex h said:
Your temps look fine to be honest if you think the funding might be restricted take back off case and check what are your temps when doing your normal things like gaming when I had my luxe water cooled I took the front metal panel off so the rad got more air passing through it
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I think my main concern is that the cpu is an instant hit on temps, but the gpu doesn’t do this, whether it’s just how they’re different components and they work different as I don’t know as this is my first custom loop
 
I think you'll find it's normal behaviour as its gone from idle to working hard what does it do when your gaming your temps are well within the stated if I remember right my gpu was always lower than cpu
 
Very much normal, temps are perfect. Just the way cpus are unfortunately.

Some if it comes from the fact it has to transfer heat from die-tim-ihs-tim-block vs die-tim-block on a gpu. As well as general gpu vs cpu design. A gpu is quite spread out with lots of cores working together giving much better surface area and heat transfer.

whereas a cpu core is quite small and the heat is more concentrated in comparison.
 
tyler_jrb said:
Very much normal, temps are perfect. Just the way cpus are unfortunately.

Some if it comes from the fact it has to transfer heat from die-tim-ihs-tim-block vs die-tim-block on a gpu. As well as general gpu vs cpu design. A gpu is quite spread out with lots of cores working together giving much better surface area and heat transfer.

whereas a cpu core is quite small and the heat is more concentrated in comparison.
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That's good to know thank you :)

Think however I have a faulty psu as I keep getting a red cpu light and no post, but works with a back up psu I have so need to sort that out now, never ending :p
 
What's happening is that the CPU tends to have a bigger gap between water temperature and die temp. Then the water temperature is rising under load, over time, until it reaches a balance with cooling.

So you boot up and your water is say 22° as that's your ambient room temp, your GPU sits at 25° because it's doing basically nothing. Meanwhile the CPU has been booting and running the OS, and even at "idle" background tasks cause it to be 35° when clocks are raised.

Half an hour later, water temperature is 30° so CPU has gone up to 42° idle. And as soon as you pop a load onto the CPU its temp can jump 15° because of core voltage. If you take the load off it drops those 15° again, but all relative to the water temp. Make sense?

This difference ("delta") of 10-25° over water temp is normal because of the silicon design mentioned above, tends to be bigger with overclocks and raised core voltage etc.

The GPU however tends to be more like 3-7° over water temperature, and more consistent. Because your system shares water between CPU and GPU, you'll see the gradual increase happen to both.

My system at boot idle: CPU about 30-35°, GPU about 27°. At max water temperature, CPU idle about 45-50°, GPU about 43-45°. Put a load on and it's CPU 60° GPU 53°.
 
LuckyBenski said:
What's happening is that the CPU tends to have a bigger gap between water temperature and die temp. Then the water temperature is rising under load, over time, until it reaches a balance with cooling.

So you boot up and your water is say 22° as that's your ambient room temp, your GPU sits at 25° because it's doing basically nothing. Meanwhile the CPU has been booting and running the OS, and even at "idle" background tasks cause it to be 35° when clocks are raised.

Half an hour later, water temperature is 30° so CPU has gone up to 42° idle. And as soon as you pop a load onto the CPU its temp can jump 15° because of core voltage. If you take the load off it drops those 15° again, but all relative to the water temp. Make sense?

This difference ("delta") of 10-25° over water temp is normal because of the silicon design mentioned above, tends to be bigger with overclocks and raised core voltage etc.

The GPU however tends to be more like 3-7° over water temperature, and more consistent. Because your system shares water between CPU and GPU, you'll see the gradual increase happen to both.

My system at boot idle: CPU about 30-35°, GPU about 27°. At max water temperature, CPU idle about 45-50°, GPU about 43-45°. Put a load on and it's CPU 60° GPU 53°.
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That makes perfect sense, thank you
 
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