Finally got my Maximus swapped in (after having it sit in a box for two weeks, and then testing random chips for another).

Maximus Formula S.E. BIOS 0505
Q6600 G0 L626A840 08/13/07
9x400 = 3600
BIOS VCore: 1.47500 V (1.456 V in CPU-Z)
VID = 1.3000 V

No problems with X-Fi in last PCI slot.
No problems going from 975 (P5WDH) -> P35 (P5K-DLX) -> X38 (Maximus Formula).

I said I was going to swear off Asus, but the Maximus Formula seems to be the only decent X38 board available in Toronto at this time.

FINALLY with this new chip I have 3.6 stable for at least longer than 2 minutes. I had it Priming small FFT for an hour which is much better than my last two chips (B3 and G0) who would either error on two cores (B3) out or outright BSOD (G0).