Graphics Crossfire and Windows XP x64 - help

Before I state the problem here is a breakdown of the system hardware.

Intel x6800
Tuniq Tower w/ Delta fan (up to 150CFM!!!!)
Asus P5W64 WS Pro
4x1GB GSkill PC8000 HZ
Sapphire X1900XT Crossfire Edition 512MB
HIS X1900XTX 512MG
Areca 1230 w/ 4xNEW 36gb Raptors
2xOLD 36gb Raptors
Soundblaster Xfi
Tagan Dual Engine 800W PSU

I have installed Windows Professional x64 Edition on a RAID 0 array. All updates, and most recent drivers for all enabled hardware.

Catalyst drivers installed are 7.2 and directX9.0c. All is fine until I enable Crossfire. At this point I should point out that the two graphics cards have run in crossfire mode without problem in Windows XP Pro before I had a motherboard change and RAID array failure.

Once Crossfire is enabled and you try running any of the Futuremark 3DMarks there is either a directX error or the system hangs with a black screen or you get a BSOD due to one of the ATI dll files. The system freezes if the Catalyst Control Centre when you try to change either 3D or video settings.

It there a problem with 64bit systems?
As stated the same system ran this fine under XP Pro.

Any help appreciated.

 

It maybe that those version of the drivers do not support crossfire in vista 64-bit. Are they 64-bit vista drivers?!

 

Yep they are the 64-bit drivers

 

Hi. The only way you are going to make crossfire work is to use Vista 64. I have tried xp pro 32 and vista 32 and no luck. I will try XP 64 too, but it works ok with vista 64.