Umm, be aware of this:
There are three types of AGP card available: AGP 1.0, 2.0 and 3.0 (carrying a main supply voltage of 3.3V, 1.5V and 0.8V, respectively).
A universal AGP 8x/4x slot can handle AGP 2x/4x as well as 8x cards, but most newer motherboards are equipped with an AGP 2.0/3.0 keyed slot, which means that older AGP 2x/1x cards will not fit in, and if you *try* to get it to fit in, all you will end up with is a nice fried paperweight.
The same goes for newer graphics cards that are not backwards compatible with AGP 1.0 slots.
AGP 1.0 slot:
AGP 2.0/3.0-only slot:
A universal AGP slot has no notches, and any card can be used (unless stated otherwise by the motherboard manufacturer).