hi there first time guru poster, looooooooonng time lurker (fixed a lot of problems thanks to these forums). im at wits end, i purchased a new system in april this year ( 8 weeks ago) it consists of asus rampage 4 formula 16 gb ram 128 gb intel ssd i7-3930K 750w corsair psu 2 x sapphire 7870 ghz edition cards i built the system, installed win7 64, all updates etc bios and whats not, latetest vid drivers which were 12.3 at the time. what is happens, since basically day 1, is one of the cards goes to black screen, and the fan goes to 100% or really loud, whilst the other card is still displaying what ever i was doing on the 2/3 monitors so, since then ive tried all driver version, 12.3 rite up to latest 12.6 beta, ive changed the cards around in pci slots, i dont run cross fire, i just run 3 monitors 2 off 1 card, 1 off the other, but i still have this black screen persist, playing eve online, or world of war craft. The other card just locks the system up completly, no blue screen, no nothing, and it requires a hard reset. so i pulled the black screen card out, put it in sons computer which is a i930 build, and it done the same thing on a single monitor, whilst playing games., the 2nd 7870 card still locks my main system up. So i have pulled both 7870 cards out of my main new system, and are currently running 2 x 6870 cards, been running all 3 screens on them non-xfire, havent had a single crash in 6 days, where before with the 7870 cards i would get a crash anywhere from 10 minutes of playing to 5 hours of playing. things i have tried changing cards around in the pci slots all drivers from 12.3 to the 12.6 beta declocking the cards to ati defaults disable ulps changing dvi/hdmi ports fresh install of win7 + 12.6 beta's using cards on another system, with same results and errors confirming that current build is stable with my previous ati 6870 cards. im really at a loss at what to do here, i cant give you a file dump, because they dont give me any, one card goes black monitor and the fan goes to max, even though the temps show fine, the other just hangs the whole system up, no blue screen, ot video stopped recovering etc etc im at the point now where im going to rma both cards, because frankly, i can see there at fault, either hardware or the software, because the 2 ati 6870 cards work flawlessly.