Hi guys, hope you can help! I've recently installed a new graphics card - BFG nVidia GeForce 8800 Ultra (768mb). This single card replaces my previous SLI setup of two 7800GTX 256mb cards. When I'm in the Multiplayer screen for Call of Duty or Call of Duty: United Offensive (where you change options and select a server to join a game) and also in-game, the mouse moves in a slightly jerky motion around the screen rather than moving smoothly. It seems to do this stutter every 2 or 3 seconds. CoD2 is fine as is ArmA. System spec: CPU: AMD Athlon 64 FX-60 Dual Core M/Board: ABIT AN8 32X RAM: 2 x 1GB Corsair PC3500LLPro Sound: Creative Soundblaster Audigy 4 H/Disks: 2 x 250GB Samsung Spinpoint SP2504C PSU: Tagan EasyCon TG580-U15 - 580watts OS: Windows XP Pro I'm using the latest official nVidia drivers: 158.22 released 17 May 2007 and I've also tried 162.18 (beta) released 5 July 2007 I've tweaked with (reduced) various graphics settings and, via Task Manager, I've changed the Affinity to one CPU and I've increased the Priority - all to no affect. However, on looking at the CPU usage when CoD:UO is running (in the background) the percentage is constantly changing back and forth from around 29-31% to around 50% and back again. This seems a bit odd to me as the game is just idling at the options screen. This pattern continues whether there is 1 or 2 CPUs being used. I'm at a loss as to what could be the issue so any thoughts would be greatly appreciated.