Some P4P800 information for yas all.
Using a 2.53C1 cpu @ 175fsb for initial testing @ default 1.525vcore. Vdimm at 2.55 (lowest), and Vagp at 1.55 (lowest)
Flashed to 1006 bios as anything between 150fsb and 200fsb won't post with 1005 bios that came with the motherboard.
175fsb, 2-2-2-6-4 (auto/auto), MAM=Auto, sisoft 4227, aida32 4194(read)/1254(write)
175fsb, 2-2-2-6-4 (auto/auto), MAM=Enabled, sisoft 4258, aida32 4365(read)/1371(write)
MAM (Memory Acceleration Mode - ie: memory turbo set in the AMI bios)
These are just single runs, so they could vary.
Oh BTW, anyone with Swiftech MCX4000s, forget about using the cpu fan header. There is about 1mm of clearance between it and the heatsink, and definately no room for the 3pin fan header plug. I am using the case fan header now. Oh well, minor annoyance.