Quote from MadCatX :

Well, I said that LFS isnt sensitive on OCed systems, but try to downclock your CPU. If U will get higher FPS, U are that unlicky man and LFS doesnt like OCes on your sys. If your FPS will be the same or lower, U probably got the same problem as me. I am still working on it to get SMOOOooooooOOOTH framerate.

Keep up on this thread

LFS ran fine when I had my 9700pro and once I cleaned the drivers and installed the X800XL with an updated MB bios my FPS dropped. All my other games apart from ISI ones have shown increases.

I have the same issues......My temps are fine though. I used to run LFS with my 9700pro at 80-90fps now with my X800XL my fps are 20-30fps. Everything on my PC is fine software wise and drivers. I have a program to gauge if my cpu throttles back or not and I get nothing. It goes strong

my specs:
P4 2.4b O/C @2.97Ghz
MSI 845E 533 mhz
80 gig Maxtor 7200 rpm
1024MB Corsair PC3200 Dual Channel DDR 400Mhz runing @ single channel
ATI X800XL 256DDR3 radeon