How do I know if a video card is compatible?

I have a 3-year-old Dell Inspiron 530 with a 2.00 Ghz Pentium dual core processor and 2 GB of RAM. I dont know what the video card is, all i know is it supports directx 9 and i need a new one. If anyone can tell me how to find a good quality graphics card suitable for casual gaming that will work with this computer that would be awesome. Models and priices would be even better.|||According to this http://support.dell.com/support/edocs/sy… your computer supports PCI-E video cards. Which card you can put there now depends on the power supply requirements of the card. Dell's site doesn't say what sort of wattage your PSU can deliver, but there are decent video cards out there that only need a 300W power supply. If you have a beefier power supply (such as 500W) then you should be able to run a more powerful card like a 5770. Of course your power supply can be upgraded if needed, but it's trickier than installing a video card.|||The first thing you should do is try finding out what the motherboard in it is, then check out that motherboard to see what is compatible with it. You might be able to find out what the motherboard is by looking the specs for it up on the Dell site.|||check the specs