> I've been having video card troubles for a long while now. My card basically overheats and shuts off the whole PC whenever I try to play a game that uses any 3D in it at all.
>
> So I'm looking at getting a replacement. Specifically, one of these: http://www.computernyc.com/jatgefagp3d31.html
>
> However, I have no idea how to "make sure that your motherboard must be 0.8 or 0.8 and 1.5 volts both compatible" as the site instructs.
>
> Any thoughts?

You're very very probably fine. 3.3-volt AGP signalling hasn't been used for a few years now. If you can provide some information on the motherboard (model number would be great), I could tell you for sure.

However (because I'm an incorrigible meddler), I can't really recommend the particular card you're looking at; the GeForce 4 MX series was kinda stinky when it launched, and hasn't aged that nicely. Fortunately, the much much better FX5200 is available for even *less* money than that, if price is a serious concern. :-D