great! i thought it was just a driver issue, guess not? 3870X2 was tested with the same drivers, right? :o

also, so if it's truely a hardware-based issue, what about 4870 CF? is the interconnect that different that those cards will show symptoms like the 3870X2 did that sampsa tested?

Sampsa, are you able to do the exact same comparison between 4870X2 and 4870 CF? that would mean a lot.