Depending on how much your RAM can take, I'd say at least around 3.1-3.3. The nForce chipsets for Intel's haven't really been great overclocker's from what I've seen on the forums though. At this point in time, I think you're biggest limiting factor may be your RAM. What speed is it rated for?
It all depends on your board, your memory, your cooling, and your power supply. If it's all pretty decent, and you got a good chip, you could probably hit 3.3.
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