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Alarmingly high temps on watercooled GTX 570

sjong1

sjong1

Senior member
I've got a watercooling loop that cools an i5 2500k and two GTX 570s (one ASUS DirectCUII and one Reference).

Before I added the ASUS, the Reference card would hit about 45C under furmark, while the CPU would hit 60 under prime (furmark and prime both open).

My loop is now:

Res->pump(mcp35x)->rad1->Reference (EK FC-580GTX)->ASUS (EK Supreme HF)->rad2->CPU->res

For some reason I'm getting idle temps in the 50s for the reference card. The ASUS gets about 33 and the i5 2500k sits around 33 as well. Furthermore, under even light loads (like left 4 dead 2) the reference card climbs up to 95C and it doesn't seem to be heading toward a ceiling. The ASUS card, on the other hand, does not get above 40 degrees.

Furthermore, the reference card takes forever to cool down (still sitting at 58 minutes after exiting l4d2).

One thing I did change from the previous loop was the inlet/outlet choice for the reference card. The full cover block has four ports, and the instruction manual says that any port may be used as an inlet/outlet.

Before I had the bottom right as inlet and top left as outlet. Now I have bottom right as inlet and top right as outlet. I don't think this should be the cause, but I'm starting to think it might be something with the block. It doesn't seem that water is passing through correctly (high idle temps, ramp up during load, slow cooldown)

Any help would be greatly appreciated.

*EDIT* Also changed the two high flow fittings on the reference to 90 degree swivel fittings.
 
Last edited:
My guess is that the waterblock is not making proper contact with the GPU core. High idle temps and no ceiling are telltail signs. If it was a waterflow problem as you mentioned it would affect the CPU temps as well since your loop is a single loop.

My advice is to take off the waterblock, clean off old thermal paste etc. If you can I'd buy some new thermal pads for the RAM/VRMs as well while you are at it. Reinstall making sure everything is making proper contact and see how it goes.
 
sjong1 said:
One thing I did change from the previous loop was the inlet/outlet choice for the reference card. The full cover block has four ports, and the instruction manual says that any port may be used as an inlet/outlet.

Before I had the bottom right as inlet and top left as outlet. Now I have bottom right as inlet and top right as outlet. I don't think this should be the cause, but I'm starting to think it might be something with the block. It doesn't seem that water is passing through correctly (high idle temps, ramp up during load, slow cooldown)
Click to expand...

I do.

This is what I'm thinking. With the full coverage blocks, you usually have to use one left and one right port. Whether you use top or bottom doesn't matter - what matters is one left and one right.
 
Zap said:
I do.

This is what I'm thinking. With the full coverage blocks, you usually have to use one left and one right port. Whether you use top or bottom doesn't matter - what matters is one left and one right.
Click to expand...


This is the problem.
 
Thanks, everyone. I actually flipped the ports that night and got everything up and running. 35C idle and 50C load on both cards now. I just haven't been able to get back in and update this thread since then.
 
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