This is what pisses me off about m/board manufacturers, they say the boards support this that and the other yet they don't, all the issue is here (and with my Black Ops) is sloppy bios programming.
Now that i7 is out we 775 people will be lucky to see (if we ever do) bios upgrades to address these issues
My advice to you (I feel like I've lead you down the garden path tbh) is to drop the memory back to the 333/800 strap and work from there by raising the FSB and lowering the multi (if required)
See if you can boot at 400MHz FSB with a 6 multi (we're just testing so don't worry about the cpu speed right now
) using the 333/800 strap
This should be well within the capabilities of your hardware
EDIT: The upside of this for you is that your memory may be able to run tighter timings, e.g. 4-4-4-12-1T at 2.1V maybe, because of the frequency reduction