yeah I agree this looks like bad flashing to be honest, that or they oc'd their card too much (as has been mentioned before, GDDR5 is quad channel, as small 100mhz oc is actually 400mhz ddr and that pushes the ram beyond its limit, most likely the issue is not enough voltage fed to the ram if that's the case or the ram overheated and died) by flashing a hacked bios.