Totally bizarre WC Issue

[WJA96]

I hooked up a quick and dirty cooler install to test a GTX280 with a waterblock and I was really horrified when I saw the temperatures in GPUz. After about 20 minutes the water-block was too hot to touch and I shut everything down. The odd things is that not only was the GPU block hot, the radiator was hot and the water pipes were hot.

This leads me to believe that the water-block was working correctly, but the radiator simply couldn't cope with the heat loading. Except it was a Feser TFC 360 with 6 fans on it.

Can anyone think of a reason why this should be the case?

The water fairly whizzes round the loop, so I don't think it's that.

I've not split the block open as it invalidates the warranty, but it does appear to be free-flowing ie. not blocked.

EVGA SC GTX280 with HydroCopper 16 block
XSPC Reservoir top fitted to 10W Laing DDC
Feser TFC 360
6 Yate Loon SL 120mm fans in push/pull configuration
Approximately 60cm tubing length (30cm each leg to from rad)
XSPC 3/8" ID tubing on DD High Flow 1/2" barbs

The radiator, pump and res are known to be good, only the graphics card is new.

I'm genuinely baffled.

 

[WJA96]

I thought that too, but where? The rad was hot top to bottom and the bleed screw was opened. And it took a decent amount of coolant to fill it.

 

[WJA96]

Are you sure the copper on the block isn't conducting electricty by shorting out on the card somewhere. I had this once with a chipset block, temps were skyrocketing but all watercooling equipment seemed fine. Turned out it was a nut catching on a mosfet . Luckily everything still worked fine afterwards. Something you might wanna consider.

That's interesting as the power figure in GPUz was very high indeed - something like 77A whereas the other cards in the system were only pulling 25-35A. I have three of these blocks fitted to BFG cards and they're very good, but this is an original EVGA card bought from the 'bay. I'll take the block off and check, as the fact that EVERYTHING was very hot just leads me to believe that everything was working, it's just that the system wasn't able to dump off the heat.

 

[WJA96]

I had my GTX with a EK full cover block. Rad was cool and so was GPU-z Loading 47C. Must be a problem

Yes. I agree. Major problem. The EK blocks are good, but the EVGA ones are better, just this one looks like it needs RMAing unfortunately.