Sorry I forgot to add in my previous post what resolution are you running in?
1280 X 1024 being 4:3 or 1440 x 900 being 16:10 or something else?
But at this stage with having a 19" monitor 512MB of ram on a video card will be sufficient. Running in much higher resolutions requires more ram on your video card so as it does not affect performance. Buying a video card with 1GB of memory to run on lower resolution monitors is really a waste of money and you would be better off to put the money you save from not buying the 1GB version towards a faster 512MB video card. Unless of course there is very little price difference between the 512MB and the 1GB. At best you would only see a couple or few FPS difference between 512MB and 1GB video memory when using a 19" monitor.
The big difference comes in once you start using 22" and larger monitors running in higher resolutions.
BTW are you certain your motherboard has a PCI Express slot?
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