I don't really know what AGP aperature does but you are supposed to set it two 1/2 of your total RAM. Also, if you set it below 32mb then your AGP card will act like a PCI card, that is really slowly.
AGP Pro has extra pins, the edge connector is longer. The extra pins are to provide more current for power hungry cards like professional ones. I don't know if there are any additional signals. Consumer cards like Geforce 2s, 3s, ATI Radeons, etc. are all AGP not AGP Pro.
Now you know everything I know about these subjects.
My system consists of a Duron 600 @ 900mhz (Normally it's at 1007 but it was a hot day), an Abit KT7, 384mb of OCZ SDRAM, OCZ Monster II HSF, a VisionTek Geforce256 SDR (overclocked to 135/185 normally and 150/210 when games demand), Maxtor DiamondMax VL40 hard drive, HP 8100i CD-RW, and misc old hardware.
<P ID="edit"><FONT SIZE=-1><EM>Edited by phsstpok on 06/26/01 00:43 AM.</EM></FONT></P>