(In reply to Alexander Tsoy from comment #2) > (In reply to Michel Dänzer from comment #1) > > Seems to work fine on my Cape Verde. What brand and model do you have > > specifically? > > Gigabyte GV-R775OC-2GI. JFYI: This card was unstable when operating at 850Mhz sclk (same problem on Windows). After flashing VBIOS from GV-R775D3-2GI (same card physically, but with 800MHz sclk) it works fine now. So this looks like a faulty vendor overclock.