I tried nTune and it can give you a ballpark area for a stable o/c for PCIe and RAM timings. I couldn't get it do even a halfway decent "FSB" overclock on my (as of today) former Winnie 3000+. Without trouble I got it to o/c about 40%, nTune reported a max of 11%. I think they still need to work on it (as in: a lot).