I recently upgraded from 2 5770's in crossfire to 2x XFX 6870's for some extra graphical goodness. Long story short its been weeks of misery re installing windows, drivers, bsod's, tweaking and testing.
I also run eyefinity 5760x1080...
So finally I got everything running well apart from the PC just took to randomly switching off in game. No warnings, errors or anything. Trawling through the event log I was getting an error that the system was shut down due to gpu overheating. So grabbed a copy of MSI afterburner and have been monitoring the temps...
Basically either card installed solo runs about 40 deg idle and 60 deg flat out. But if installed together (not in crossfire, so one card is idle) the primary card hits 102-103 deg.
If I enable crossfire the primary card easily gets to 105 deg and at 107 deg is where the pc shuts down. I have swapped cards in the bios so the other card is the primary and then set up monitors and crossfire on that, but whichever card is the master hits the limit. The slave card also stays around the 60 deg mark.
I have even tried underclocking the master card by 50 mhz to try and keep the temp under control but even so it still hits 105 deg!!
The cards are brand new, and speaking to XFX they said the ideal max temp is about 80-90 deg, although they could withstand 100, but me thinks these temps will kill them swiftly.
I don't want to buy 3rd party heatsinks, as for one thats gonna cost a lot extra, and void the warranty. If I was to do that I could just have got better cooled cards in the first place...
I can't get any extra cooling through the case, as thats got 2x20cm fans in and a 12cm fan in already running flat out.
I have tried each card in each position and get same results. Also tried case open and it actually overheated faster.
MB is crossfire certified, although there is literally no space between gpu's, there is a 3rd pci slot, but cant use that as its only a x 4 slot, and the double height card won't fit in the space anyway.
Also tried both ccc 11.12 and 12.3 drivers, and get same results, and tried forcing the fans to 100% in ccc but they still overheat.
M B: Gigabyte ex58 usb3, 3.2ghz i7, 6gb 1600mhz ddr3 ram. Case collermaster enforcer. 1x20cm intake fan front. 1x20cm exhaust top, 1x12 cm exhaust rear. (open slots for extra intake). OCZ ZT 750w psu. 2x XFX 6870 687A-ZHFC.
Can't say I had any of these issues with the 5770's and when overclocked some way they were not that far behind. These new cards have no thermal headroom for overclocking, hell they won't even run at stock speeds.
I'm at a loss with what to do apart from rma these and go and buy something with a cooling system that works stuck to it!
Anyone got any ideas wtf is going on?