No. The Sandy Bridge chips are different from the Core 2 Duo in that it isn't possible to undervolt, or change the CPU clock multiplier from the fixed ratios programmed in. However, the chips do incorporate "turbo boost" which is a little bit like automatic overclocking. For instance, the 1.8GHz i7 can actually run at 2.6GHz with both cores running, or at 2.9GHz when just one core is needed.