To start off and eliminate the obvious things...I have reinstalled drivers for all hardware, i've defragged, cleaned the computer up, etc. I dont run background programs while gaming, i've reinstalled COD4. I have also bought a new PSU, motherboard, CPU and RAM. None of these things have even BUDGED my issue. And at this point i'm pretty desperate for some good tips or information. Hope you can help. To make it simple....my only problem is my FPS....it just stays in the 20's on average. In a more video demanding area of the map it drops below that; when i'm around nothing it might hit 35 FPS if i'm lucky. The only thing I have changed from the stock graphic settings are bullet impacts and blood. I have also changed the resolution to 1280x1024 due to a 19 inch monitor. Specs Motherboard=Biostar NF520-A2 AM2 CPU=AMD Athlon 64 X2 5000+ 2.6GHz RAM=2x1024mb Corsair XMS DDR2 800 PC64000(2 gigs dual chan) Video Card=ATI Radeon x1650 Pro 512mb PCI-E PSU=Corsair HX 620-watt OS=Windows XP I do not overclock. Given I just installed a new motherboard, could there be a BIOS setting issue? Its probably unlikely, it doesn't make sense to need to change BIOS settings before getting full performance on a motherboard.