If you don't want to lie a little to your local Apple store, don't bother reading this, for the other 1.6GHz users, read on. How I did it: 1. Booked an appointment with a Genius at local Apple store. 2. Prior to appointment, removed CoolBook completely 3. 15 mins prior to appointment sat outside Apple store watching ~55 minute YouTube video and loaded up all the CPU taxing programs I've got. 4. Using Activity Monitor "CPU History" window, demonstrated core shutdown to genius. 5. Lied. Told genius I'd spoken to previous Apple tech who told me the problem only existed in the 1.6 model (this is untrue btw). 6. Genius booked me for a Main Logic Board replacement. Apparently they are out of, or no longer carry 1.6 replacement boards, so I "had" to get a 1.8GHz instead (remember, CPU is soldered to logic board). 7. Took 6 days for the board to come in. Dropped off Air, and the swap was completed in under 4 hours. Notes/Observations: - No significant increase in performance for everyday tasks. Does encode video (XviD recodes) a few FPS faster. - My serial number no longer appears in System Profiler (see screenshot arrow) - CoolBook settings are different. Old chip was able to handle 1.6Ghz @ 0.9V, but now needs 0.95V @ 1600MHz (and 0.965V@1800MHz). - Thermal paste application on new chip was DRASTICALLY better than old one - I still re-did it with AS5 though If you're able to get a free upgrade too, I'd like to hear about it.