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Water Cooled 6950's Tempature Help

post #1 of 15
Thread Starter 
I have 2 6950's and after benchmarking Heaven 2.5 the temps on one card are significantly higher than the other. I am running two connectors between the cards so that should help normalize temps between the two right? Here's the temps with gpu-z.

post #2 of 15
cool liquid + hot GPU1 = warm liquid for GPU2 *shrugs*
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post #3 of 15
Thread Starter 
So 16 degrees of variance is about right?
post #4 of 15
Quote:
Originally Posted by ks1 View Post
I have 2 6950's and after benchmarking Heaven 2.5 the temps on one card are significantly higher than the other. I am running two connectors between the cards so that should help normalize temps between the two right? Here's the temps with gpu-z.
You should that the block apart and check the contact surface of GPU core and Vreg. Though with 2 connectors should not with disparity more than 10C ffrom the other card.
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post #5 of 15
Those temps both seem high, though with my 6950 crossfire setup (overclocked and unlocked) I get less than 3c temperature difference between the cards running full power.

I would check your flow rate, if it's fine, then I would re-seat the cooler, checking the thermal paste and pads.
post #6 of 15
Thread Starter 
how do you check your flow rate? I have been thinking that maybe the pump that comes with the rasa 750 rx360 kit is not powerful enough to push 2 gpus blocks, 2 rads, and a cpu block.
post #7 of 15
That pump probably isn't a great choice for that much hardware. For signs of flowrate, often temperature is a good indicator of whether you've got enough flow for it.. Also look for surface disruption in your reservoir. You should see some shimmer of flow movement, or watch for how quickly bubbles are flowing through your setup if you shake your case or radiators or tubing around.

I would recommend either a swiftech MCP355 or MCP655 to replace your existing pump with. Often people (myself included) recommend switching to a pump that isn't the stock RASA one when building their system out from the original RASA kit, due to the high failure rates that were occuring with the stock RASA pump, as well as the flow rate, which is fine for a stock loop, but once you expand your loop it's best to add a pump with a bit more oompf.
post #8 of 15
I would say that either you have air in your blocks, or you haven't seated them very well.

I run a very similar setup to yourself, i7 930 and 2 6950 GPUs all under an XSPC RX360 Kit using the pump that came with it, my current idle temps as i type this are 29C and 28C.

Under load im yet to see higher than 37C on the GPUs with all components running at their stock frequencies.

So like i say, you either need to get some air out, which is what i would try fiirst. If that fails id take the loop apart and reseat the GPU blocks with fresh TIM
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post #9 of 15
Thread Starter 
whats the best way to get air out of the blocks?
post #10 of 15
Tilt case around
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