The new Intel HD 4000 is roughly 40% more powerful than the old Intel HD 3000. The main difference is the integrated graphic core. Not much of a difference, but Intel never stated Ivy Bridge was going to be more powerful. Ivy Bridge CPUs are about 5% more powerful than a Sandy Bridge CPU so a mobile IB CPU running at 2.0GHz would be equivalent to a mobile SB CPU running at 2.1GHz. Again, the 20w difference mentioned above applies to the desktop Ivy Bridge vs. While Ivy Bridge CPUs do use less power than Sandy Bridge CPUs, I have not seen any review which compared the mobile versions of those CPUs.
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