Intel BTX has a locked down BIOS as far as I know. The board you have is about as good as it gets in BTX. What board# do you have. I've seem some listed as DDR3 some DDR2. You have 4 phase VRM, rare in a Dell. Your AGP16x slot is 1 slot back from the cooler mounting so 2 slot video card will fit (rare in BTX). There's another AGP slot so you still have one left after GPU covers the 1x slot. XPS has more Bios options than other Dells. Don't know which though. I think it should support 1333fsb. QX9650 can be overclcoked,QX6850 also. In 1066fsb QX6800SLACP, X6800 also. DDR2-800=DDR3 1066 due to lower latency. In LGA775 speeds there's not much in it either way. I've been looking at BTX MBs for years, yours is one of the best already. I'm getting 3.73GHZ on a 1st Generation Quad. You should get that or more with 45nm chips. Better video card support. You probably already have a good heatpipe cooler D9729, or T9303(better). Forget the MB swap just overclcock what you have, max. out the memory, and good GPU. You can look at my posts and pics. at Overclock.net as Retrorockit. Throttlestop software gets control of volts and Multiplier in Windows, with Core2Extreme it allows overclcocking. I'm actually jealous of what you already have .