Isn't 5:4 saying the cpu bus is greater than the ram speed thus bottlenecking fsb? I juat read here that at stock speed 4:5 is better than 1:1 though. Not sure if that holds true at other speeds. http://www.yougamers.com/forum/showthread.php?t=65718
My stock NB voltage is 1.25v and has a passive stock cooler (no fan). Is 1.4v safe? Not used to messing with NB voltage. I'm currently at 1.4 on my cpu but it drops to ~1.376v when I run a p95 blend torture. Temps are peaking at 67C on the fft 8k iteration though. They drop down to 63ish though during the same iteration, jumping around in between during the 8k's.
It also seems like from what I read people have had mpre success OCing with the 680 board and I did see one post about someone else with an fsb limit on my board in the low 1500s. Didn't find overwhelming evidence that 650s were bad at ocing c2d's but I'll have to look again to see what kind of numbers people were getting with the mobo.
Lastly, theoretically would 3.2ghz at 1424 fsb be better than 3.0ghz aat 1500 and would it depend on what type of application I'm usually running?