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With that said, having an ATX form case does not enable you to upgrade things in your PC.
What you really want to know is what your motherboard can handle. How many slots of ram does it have, what type of RAM can it take, how fast is the ram that it can take, what kind of processors does it accept, does it have an AGP slot, is it 2x 4x or 8x? Many questions you have to answer in order to know about upgrading.
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What I meant was that if you've got an ATX case, odds are you have a somewhat recent system meaning you can upgrade it (actually by the word 'upgrade' itself, you can upgrade anything really). If you've got an ATX case this simply means you've got an ATX mobo (well it doesnt but for damn near everyone with an ATX case, it does) and if you're running an ATX mobo, you've got a somewhat recent system which you can take in somewhere and it can be upgraded. Even if not, you can still 'upgrade' and use the same case.
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What I did next was discover that they made PCI video cards for motherboards with no AGP slot like mine. However, it was not a good buy because the pipeline of a PCI slot as opposed to an AGP slot was huge. I ended up spending just as much money for an AGP card, and I got about 1/10th the quality and performance as I would have if I bought an AGP card (if my motherboard would have actually had it).
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I think finally someone mentions something i've believed in a long time!
PCI is a far super bus compared to AGP .... of course nowadays there are very limited cases where that's true (but still!
) Of course back in the day, comparing the 266Mhz core to a 66Mhz AGP was no contest and the direct memory access didnt make much of a difference (since the memory was slow anyways)