Hi, As i have said before i have tested the new 8.7 driver and 4870 w 4850 Crossfire. Test System: X48T-DQ6 QX7600 4 GB DDR3 First Test: HD 4800 Hotfix Driver Second Test: 8.7 Beta Driver As you can see, there is a %3.7 increase in the performance. Third Test: 8.7 Beta Driver 4870 + 4850 CrossFireX Note: In this test, i saw too many artifacts. In some parts the bench was fully invisible. There was just white screen but the bench has ended with no probs. And yes, i know this is a stupid combination The increase is %16.5 BTW am i the first person to make such a combination?