I have run my volts at 1.5 ran fine was running a 500 fsb but I did not want to leave it that way it was just fun to see LOL. There is a point at which speed leaves you with less stability and you need to find that point. sometimes it won't show up for hours and the right in the middle of something fun bam blue screens and such. run some burn in software for 2 3 hours should give you an idea since no real program will give 100 usage unless encoding thns and such. I would say you can set your ram timings to 555-12 easy would not try 444 12 that would be a bit much. 1 last thing is the north and south bridges you might wanna give a little boost on the volts start wth 1 bump from stock and go up to 2 or 3 bumps would not go much more than that on an everyday computer gunna run hot as it is 
