IIRC, the AGP apature is the amount of system memory reserved for the video card if the GPU runs out of memory.
Generally, it is said to keep it at the same, or double, your GPU memory.
If you want to check and see if it makes a difference, try changing it and running some benchies with the different settings.
I saw a review not long ago with regards to AGP apature, but I'm too lazy to look for it right now. :wink:
Heres the link to thread dealing with AGP Apeture size <A HREF="http://forumz.tomshardware.com/hardware/modules.php?name=Forums&file=viewtopic&p=407247#407247" target="_new">here</A>
Intel P4 2.4B
MSI 645E Max-U Mobo
SB Live 5.1
WIN2K PRO SP4 <P ID="edit"><FONT SIZE=-1><EM>Edited by sparky853 on 07/23/04 01:57 PM.</EM></FONT></P>