No, the FSB voltage is not vCore, it does have an effect on system stability. I can't find the link right now, but some one performed a test and found out that higher vFSB is required for higher FSB, obviously. But it also seems that the higher the vFSB value is the less stable the system becomes. I think you just have to find something in between. Pumping it up +.1 to .2 is probably good when you reach high fsb speeds. But the actual stable value is largely trial and error.
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