Depending on your cpu you may be able to get to 3.4 (378 fsb) on stock volts. Mine did, but some of the later cpu's are kind of balky according to reports. I had to bump mch and fsb to 1.6 and 1.3 to go beyond there. Your memory might still be able to make 1136 on stock volts using 2:3, might not also. Then you could go to the 1:1 ratio, that for sure would work, albeit 'slow' (you might not notice). Using the 4:5 ratio might uncover another can of worms as I found, but I'm not sure if that can of worms applies to this speed or not. Good luck!