Richard, set your memory to auto in bios and Load Optimal Defaults.Then show us a CPU-Z Screeny of the Mem timings.
I ask this because I get more FSB runing my PC800 @ CAS 3 than @ CAS 4 The board defaults the timings to 3,7,7,17 2.1V they are good up tp 455-465 FSB.
DQ6 F3e