Greetings - I'm at my wits end. Video stuttering is making ALL games unplayable. ----------- XPS Gen 4 3.2 Ghz 1 GB ram Radeon X850 or Radeon 1800XT Catalyst 6.3 drivers Windows XP sp2 ----------- Tests thus far: RAM Ran memtest for 8 hours - no errors Ran Prime95 1024k passed 8k passed 896 passed no errors VIDEO CARD I've swapped out video cards as a test. Exact same stuttering using the X1800 as when using the X850. Other than this hitching and stuttering during gameplay, the system is generally clean and stable otherwise. Virus free. Adware free. Running updated Norton. Sound is working fine. Sure, play my Turbo Tax just fine, but just not F.E.A.R. Bad Computer! ----------- Finally some examples. The stuttering occurs (to a greater or lesser degree) when playing all games: We get stuttering scrolling issues in the Sims 2 and The Movies, to intermittent freezes in sports games like Alpine Skiing 2006. F.E.A.R gets high frame rates (as you would expect from the x1800) when doing the performance test... however as soon as you begin gameplay you get stutters and hangs... sometimes lasting a split second and sometimes SEVERAL seconds or more. Arrrrrgggghhh. ----------- Thanks in advance for your suggestions.