An FX5200 should work fine as long as you're using it for relatively low
resolutions like 1024x768 or lower. You probably could run it at higher,
but it probably wouldn't be as smooth. I always recommend 256MB of video
RAM to make sure that you don't have problems with maxing out your VRAM with
Vista. (Especially if you're running a graphics hungry program on top of
the Aero Glass.) 128MB of VRAM will work, but it may tend to get a little
cramped with lots of things running. And with 64MB, don't expect to run
lots of things at the same time. (Although it will work for just basic
computing.)