I don't have any problems with ultimate x64 and my crossfired 4870's. Have you used drivercleaner?
I realize it was cat 8.9 and didn't change. But that's quite odd to have a problem such as that. Is there a CCC profile that is conflicting perhaps?
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Air Cooled Rampage Formula Results
24,140 in 3D06 P16,463 in 3DV H10,992 in 3DV 4.2GHz Quad w00t!! 
"And Shepherds we shall be for thee, my Lord, for thee. Power hath descended forth from Thy hand Our feet may swiftly carry out Thy commands. So we shall flow a river forth to Thee And teeming with souls shall it ever be. In Nomeni Patri et Filii Spiritus Sancti."
CPU
Q9650 E0 @ 4GHz (445x9) on 1.325V (bios) |
Motherboard
| ASUS Rampage Formula x48 | | BIOS 0410 | |
Memory
| 2x2GB G.Skill PI @1069MHz | 1.9V | 5-5-5-15 2T | |
Graphics Card
Visiontek 4870 790/1100 |
Hard Drive
Seagate 2x320GB 7200.10 in RAID 0 + 250GB 7200.10 |
Sound Card
Asus SupremeFX II |
Power Supply
Silverstone DA750 |
Case
THE Rocketfish |
CPU cooling
TRUE lapped to 1000 grit | + | San Ace 1011 push |
GPU cooling
Blowers |
OS
Vista Ultimate x64 |
Monitor
42" Aquous @ 1440 x 900 (1920 x 1080 is too small) |
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CCC Alternative For Vista X64???
09-19-08
