AMD Phenom II X4 940 Review
Posted on by Thomas De Maesschalck
It overclocked up to 3.6GHz by merely changing the multiplier - and I only had to add a +0.10 Vcore offset to stabilize the most difficult benchmarks; so I think it is fair to say that most people should be able to reach at least 3.6GHz with air cooling.
Link: Neoseeker