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I have that mobo with an e2140. Managed a rock solid 3GHz with 375x8 @1.45V, +0.4V on the RAM (2x1GB OCZ stuff) with 2.50 divider (938MHz from stock 800MHz) and all on the stock cooler. Barely breaks 60C on max load (although my case probably helps, Antec P182)
If I can manage a 3GHz on an e2140 with stock cooling I wouldn't be surprised if you could manage at least a 3.4-3.6GHz with no issues at all.