Finally got my E8200 reasonably stable at 525x8 (12 hours Orthos), but it takes quite a lot of voltage... Here are the settings I'm using:

BIOS: 0504
FSB Strap: Auto (found forcing 400 to reduce stability if anything)
Mem: 1:1
Static read control: Disabled
Transaction booster: Enabled-0 (Disabled-Relax-3 which is the lowest setting did not help max post fsb and I saw a review of the mobo that found Enabled >0 didn't help performance much)
vCore: 1.475 (gives actual 1.44v under load with 0.61x GTL, within Intel safety limits!)
vMem: 2.35 (obviously depends on your RAM)
vNB: 1.70 (bit high perhaps, but doesn't seem to get hot...)
FSB Termination: 1.3 (this helped max post fsb and stability)
CPU PLL: Auto (setting higher didn't seem to help max post fsb or stability)
CPU GTL: 0.61x
NB GTL: 0.61x (lowering these GTLs from 0.63x/0.67x stabilised the system at 525x8 with the rest of the settings above)

Highest post I got was 545, but that was barely stable enough to run the bios!

My old E6550 would post 515, but was unstable at anything above 500. Didn't push it quite as hard as this one though.

The board really seems to struggle above 500, which is a bit disappointing tbh as even a P5K vanilla can do that. I doubt it's my processor holding me back and I know it's not the RAM... The NB is rock solid at 500 with 1.40v, but needs 1.55v for 510 and 1.70v to do 525 properly, surely an indication of it struggling?

I might try 0404 to see if there's any difference, I know some people have had better luck with RAM on it and mine's not doing too well (for D9GMH) on that front.