Hey, folks. First post. I rebuilt my wife's gaming machine with an Asus P5Q Pro P45 MB and two Asus EAH4850 TOP cards. Installed Cat 8.9, it says CrossfireX is enabled, but GPU-Z and 3DMark06 results say it's not. What's more, the machine is unstable running her current game, Neverwinter Nights 2; crashes after an hour. I searched extensively on Google and here, tried everything I could find, no difference. Tried the stepwise HW install, older drivers, no difference. Here's a more complete System Spec: ASUS P5Q Pro 2 ASUS EAH4850 TOP XIGMATEK MC NRP-MC651 650W ATX12V Ver.2.2 Intel Core 2 Duo E8400 ASUS Arctic Square 92mm Vapo Bearing CPU Cooler G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066 Microsoft Windows XP SP3 Suggestions? Please help - it's going to end up in divorce! Thanks!