when u run ram 1:1 in bios it will go to what u put your fsb to before you divide that by 4... it was tryin to run it at 1333. to get a 1:1 run your ram unlinked at 667 then you will be able to lower some timings...
also there are alot of ppl here who have 680i's mgcook has his posted, he ran at 3.2 24/7. nosboost has one also. veedub has one tooo. all there overclocks are in this thread