Gigabyte X58A-UD3R (REV 1.6)
GV-R687SO-1GD Gigabyte VGA AMD Radeon PCIE 2.0 HD6870 1GB GDDR5 256bit Super Overclock Series * 2 (crossfire)
ANTEC Gamer 1000 watt PSU
3*4GB Kingston ValueRAM 1333
The problems started with BF3. This game takes the maximum out of the Graphic cards. Client crashed after 5 minutes (black screen) even when we only activated one graphic card. When i checked the logs it referred to the graphic card. We installed gigabytes overclock software. Then i reduced the speed to the non overclocked version and only activated one graphic card.
Temperature came close to 90 degrees celcius, but it kept going without crashing. The fan was turning on maximum. So we had definately a heating problem when overclocked.
There is no new bios still out and in my opinion with the fans turning on maximum there is very little over what we can do or a bios upgrade can do. Let alone run 2 cards in crossfire which will heat up even more. The motherboard also does not help as the cards are very close to eachother, something which on the current motherboards is not a big problem anymore, since the space is made wider. So currently we can not run one let alone run two graphic cards overclocked as sold by Gigabyte.
Older games are not an issue. BFBC2 runs smoothely with both cards overclocked and running on full settings 1920*1200.
On a sidenote we had to change the memory voltage settings to 1.6 instead of the 1.5 that is standing in the bios. This helped with a blue screen problem.
I will contact Gigabyte support to see what they can do to solve this hardware issue.