At one point in time I knew about these things, but now it seems I'm lost. I have a compaq presario sr5110nx. Its has a pci slotted nvidia geforce 6150se nforce 430 card in it (which is what it came with). Im looking for a good, inexpensive, compatible video card and I cant seem to figure out what will work and what won't. I have access to a radeon hd2400 pro which I think is an upgrade, but im not entirely sure, and even if it is will it work for my system? any ideas, thoughts, or helpful sites would be great. Thanks