You can buy a NVidia GeForce 6600-6800, or ATI X-series, but your system is too old/slow to deal with any new AGP card (by new I mean more or less modern chip).
I have had this PC for 2 years a long time ago.
The major issues of that model are:
- SiS 661FX chipset used on its P5S800-VM mobo
- Pentium 4 519J CPU
both are bottle necks for a more powerful VGA
I've upgraded my PC with ASUS P5P800
http://www.asus.com/Motherboards/Intel_Socket_775/P5P800/
and Pentium 4 531 (with HT and extra 512 Kb of L2)
http://ark.intel.com/products/27465/Intel-Pentium-4-Processor-531-supporting-HT-Technology-%281M-Cache-3_00-GHz-800-MHz-FSB%29
after that I've noticed a performance leap, so I decided to buy an ATI X1950 Pro AGPx8
But even with new mobo and CPU, my VGA could not work at 100%.
DDR-1 is pretty slow (even if I oc'ed it from original 400 to 475 Mhz)
P.S. Buy a new cheap PC, even if it will be based on Intel Atom CPU you will gain in performance.
Welcome to the site! We're not doing specific shopping recommendations here, so I reworded (and generalized) your question just slightly, so it wouldn't become obsolete within a few months (i.e. when there are newer models of graphics cards around). – slhck – 2012-01-26T13:09:25.433
Thanks, from a SEO perspective your intervention is perfect :) From a user's perspective, more specificity is better, although it means reaching a minor audience (but more targeted). I specified the models because the only technical characteristics I gave are surely not enough to suggest a proper replacement. I agree with the deletion of the brand, I am open to any suggestion no matter what brand the video cards are. – Emanuele Del Grande – 2012-01-26T15:48:40.707
Yeah, the point is that shopping recommendations are off-topic as you can read in the [FAQ], since they're very specialized – and we're not a forum, we're a Q&A site :) I would suggest to read Q&A is Hard, Let’s Go Shopping! if you want to know more.
– slhck – 2012-01-26T15:50:43.050