Should GPU = CPU temp in water loop? - Page 2 - Overclock.net

vinzend · 2 Weeks Ago

mine is pump-res-cpu block-rad-res

is that weird?

someone from canuck taught me this..

cpu block inlet from res, outlet to rad..

mrbens · 2 Weeks Ago

Quote:

Originally Posted by skkhai

What CPU are you running? Is it overclocked?

I have 2 4870s in the same loop as my CPU. The 4870s have matching temps while the CPU is about 9-10 degrees lower at idle. During games, they're about equal... My cards are the TOP versions, so they're overvolted a little even with powerplay 2D clocks, I need to try undervolting them when I have time.

Idle, GPU: 36 (Both) CPU: 26
Gaming, GPU: 40 CPU: 38

Try remounting the block and reapplying TIM.

Thanks for the input. I thought my CPU temps looked high compared to the GPU temp. Is your CPU before or after the GPUs?

First post had all the info. i7 920 & 4870x2, neither overclocked.

Is it safe to try carefully remount with the liquid still in the loop? I don't even know how I'd drain the loop! I'd like to hear from other people with the i7 Heatkiller v3 in same loop after a high end GPU first to see what temps they have.

I had a feeling I may have used too much MX-3 TIM while mounting the CPU block on the mobo, although the amount I used wasn't overly excessive, and the temps are still better than when I was testing the CPU with the stock HSF.

Edit: just read your edit lol
Since the temps are not high enough to need to worry I may as well just leave it as it is and not risk damaging anything for the sake of a few degrees temp. I'd still like to see some temps of similar setups tho.

I'm so impressed with having a near silent PC, even when gaming, compared to the stock fan on the 4870x2 I'd been using for the last year!

Thanks for the feedback guys.

crazypip666 · 2 Weeks Ago

Quote:

Originally Posted by mrbens

Thanks for the input. I thought my CPU temps looked high compared to the GPU temp. Is your CPU before or after the GPUs?

First post had all the info. i7 920 & 4870x2, neither overclocked.

Is it safe to try carefully remount with the liquid still in the loop? I don't even know how I'd drain the loop! I'd like to hear from other people with the i7 Heatkiller v3 in same loop after a high end GPU first to see what temps they have.

I had a feeling I may have used too much MX-3 TIM while mounting the CPU block on the mobo, although the amount I used wasn't overly excessive, and the temps are still better than when I was testing the CPU with the stock HSF.

I doubt you will hear from anyone else running their loop in the order you are running yours, because it gives worse temps. I would hope your temps under water are better than your temps on stock air.

pestypest · 2 Weeks Ago

I had these same questions a while back. I am currently running Tri Sli 285's core i7 920 OC to 4.0ghz. I only OC my cards when I run vantage.
My loop

Pump> CPU>220RAD>GPUS>360 RAD>RES>pump.

I idle at 36C CPU and usually 34C cards. Then once everything heats up with room temp and game play, they usually idle the same around 40C. I never have gone past like 50C gaming so temps should be fine for you. I am running a single pump as well.

mrbens · 2 Weeks Ago

Quote:

Originally Posted by crazypip666

I doubt you will hear from anyone else running their loop in the order you are running yours, because it gives worse temps. I would hope your temps under water are better than your temps on stock air.

I can live with the higher temp if it means having a cleaner, more visually appealing looking loop than going from rad at bottom to CPU at top then back down to GPU then back up to res etc.

**Juggalo23451** · 2 Weeks Ago

Quote:

Originally Posted by vinzend

mine is pump-res-cpu block-rad-res

is that weird?

someone from canuck taught me this..

cpu block inlet from res, outlet to rad..

to get the best temps
loop should go res-pump-rad-cpu-res

pestypest · 2 Weeks Ago

Quote:

Originally Posted by Juggalo23451

to get the best temps
loop should go res-pump-rad-cpu-res

+1 the man knows his stuff

Nick911 · 2 Weeks Ago

First off the thing about the gpu heating your CPU is FALSE! This is how it works. Water hits gpu, it then raises a few C then hits the proccesser, then the rad. No biggie if the rad can handle it. If not, the heat isn't dissipated and then what happens is the overall temps raise a little, then more, then more until it reaches equilibrium and that is WHY your CPU temps and gpu temps are so much higher then idle is caused by that, not by the gpu heating the water since it will only raise a few C at most. Loop arrangement DOES NOT MATTER, except that you want reservoir(high part in your loop) before the pump(low part in your loop). Hope this clarify how water cooling works.

B.Steven · 2 Weeks Ago

Quote:

Originally Posted by Juggalo23451

to get the best temps
loop should go res-pump-rad-cpu-res

I would prefer res->pump->cpu->rad->res, have cooler water go into your pump and reservoir.

Of course, some people seem to think that if 1 J of energy goes into the water from the waterblock then that energy magically disperses throughout the entire loop instantaneously. It simply doesn't happen. Granted, water does require quite a bit of energy to increase its temperature by one degree, but you would find the water coming out of the CPU/GPU block to be a degree or so hotter than the water going in, depending on the flow rate.

Nick, exactly what were you trying to clarify?