yea srry bout using that term lightly lol... i was referring to video memory which, as mp stated, is on the actual card itself; suggests that the card could be faulty. the power supply is a good unit and is more than enough for a single 4890, so if adjusting the fan speeds doesn't help I'd be more likely to blame the card over the PSU. the card shouldn't crash due to core heat around 60c but the vRAM could i suppose...