<< Does AGP work with AMD, or does it only work with Intel? >>
The AGP bus is on other motherboards that do not have an Intel chipset.
<< And if there's 32MB on board AGP 4x Video, then do I need to get a video card? >>
That depends on what your needs are. Most of the people on this forum despise integrated AGP video. The performance usually isn't up to par, depending on your usage. In addition, a standalone AGP video card can be found with more features, faster core/memory clocks, and better driver support.