The BX platform is the most stable and fastest platform for the P3. However as mentioned above it doesn't support 4X AGP and a 1/2 AGP divider. The Abit BE6-2 is the top notch board for slot 1. Solution: Stick that 550E on there and go for the 133 fsb, there is a 1/4 setting for pci bus speed, pop a V3 in there it will run perfect at the 33% faster AGP bus. If you need more video power than pop a V5 in there, it doesn't use 4X at all and use the overclocking utility to lower the card speed to about 180MHz or so, you'll have to use your math to adjust. I just bought a V5 for $120, I have a Geforce2 GTS 32MB DDR and I like the V5 more! Everbody is saying slot 1 is dead, but that's not true, it is finally getting affordable. Take a BX board shove a 700E or 750E in there, overclock to 1GHz and use the V5, and you have a formidable gaming machine.