What is the optimal bus frequency for a NVidia GeForce FX 5200 Ultra?
 

I am trying to set up my system (see below) with optimal settings in the bios. The one thing I cannot find for the life of me is the optimal (or acceptable range) of the AGP bus frequency for an NVidia GeForce FX 5200 Ultra. It is currently set at 66Mhz. Hours of Googling have already been done and unless I missed something along the way, the answer illudes me. So I pose the question to the most computer savvy people I know. The good folks at LQ. :D Anyone have an idea?