I have a Pentium 3 computer with Intel i810 motherboard. It is 866 Mhz, 512Mb SDRAM, 20+160 Gb harddisk which is originally showing 20+137 Gb, 16 Mb inbuilt video memory. I have only three PCI slots and not PCI-express or AGP. I want to install a graphics card to my computer. Please, tell me which graphics card should I buy which will support my computer and also I want to install a graphics card having memory of 128-256 Mb or it can be more also if my pentium 3 supports it. Also, do I need to upgrade my powersupply also to install a graphics card? I want to play games like Vice city, Underground. I am currently using Windows XP. For now I don't want to spend on a new computer and I am ready to spend for a graphics card.