HD 7950 ( HIS ) Getting hot.

[paulstung]

I5 4670k
2 x HD 7950's
1 x Monsta 420 / 1 x Monsta 480 both in push pull fans @ 12v at the mo.

After another couple of weeks down I finally got my rig buttoned up, and powered on, only to find my top GPU is sitting at 69 degrees whilst browsing, and the copper edge of the block is close to being hot enough to give you a blister. Before the strip down all was good, I even had a few days in a row, of 14/ 15 hour sittings playing the Titanfall beta.

I've set a fan up to blow directly onto the card, and have managed to drop by about 2 degrees, and I've got my pump connected to an external psu, just in case I need to switch it on or off for bleeding. But I'm almost certain it's not air.

I re-timed them both with Noctua NDH14, and applied new pads of the right size. I'm lost on this one any ideas guys ?

 

[UkGouki]

the top card in any system with sli/crossfire will always be hotter than the bottom due to lack of airflow and it drawing the heat from the bottom card aswell.

but as your watercooled it shouldnt get that hot unless there is a problem with the coldplate/airtrapped blockage etc. normally there only about 10 to 15c hotter than the bottom cards even on air. .

 

[paulstung]

For my set up being in the 60's at all is strange, I've only ever seen the top card reach 57 degrees at full load. The only thing different this time is the fact I'm running them in serial, where as before I was running parallel.

Come to think about it, for some reason, I couldn't get a flow at all through the top card the other day when I tried parallel again. I'm starting to think I might have an obstruction of some description in my block. Bugger, looks like I'm going to have to drain the loop again.

Quick question only one of my gpu's are showing sensor readings via GPU Z, and have forgot, what you need to type into the dialog box through MSCONFIG, ( I think its that ) so you can set it back to "0"


So I had time today to see what was going on, and I think I have found the problem. I stripped both gpu blocks, and cpu, block, only to find the cpu block full of what looked like fluff.

Every channel in the plate was blocked, so only a very small amount of coolant must have been getting through. I have just re fitted all blocks, and re-filled the loop and all is looking A-OK, now. Yesterday between the cpu, and top gpu, there was a constant air bubble every time I powered down, and turned back on. But now all is flowing as it should.


I have no clue how grey fluff got into the loop, the only explination I can come up with is, when I gave a fitting the final turn to tighten I used a cloth, it must have got into the end some how ? All I can say is what a pain in the arse it was, and thank god, the problem was solved ( well I hope ) without having to buy a new gpu. I will find out later when I'm finished leek testing.


Yea problem solved, thank god, it was an easy fix, just a case of unblocking the cpu block. Temps are back to normal, 26 at idle and 46 at 100% load. I'm a happy man.