that really just depends on the quality of the DIMMs. 2700's are meant to run @ 166. I've only been able to oc some of mine in the past to 178. They were cheap and I didn't care too much about super overclocks then. Lots of people now are getting pc3200 or higher on those AMD Bartons, lowering the multi's and cranking the FSB to 250+ if you can afford it, that's the way to go. But you may be able to go 1:1. Have you tried it yet? What kind of RAM modules are they?