For 800-to-1333MHz FSB, you'll have to make BOTH the 800-to-1066MHz and 1066-to-1333MHz mods.
There are several topics on the 800->1066MHz mod, so you just need to check on that.
Also, I believe somewhere on this thread there was a user who actually made exactly what you want to do. I don't remember where exactly, though... This thread is huge...
Btw, BSEL mods seldom result in improved OCs... Or, even if they do result in improved OCs, the upper strap memory latency settings will probably negate any small speed gains you can get... Well, at least it's what I've read about straps and FSB... usually the lower "upper-strap" MHz are slower (memory-wise) than the upper "lower-strap" ones...
Cheers.
Miguel
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