After seeing the post on hardmac on overclocking the unibody macbook, I have been experimenting on my mba http://www.hardmac.com/news/2009-01-26/#9497 Stable overclock: CPU: 1.6ghz -> 1.86ghz at 0.925vcore, 1240mhz FSB (using RMClock to undervolt) GPU: 300/600mhz -> 450/900mhz So far it has proven pretty stable through 3dmark06 and some gaming, netting a 3dmark06 score of 2100 - putting it right on par with the stock macbook (see gizmodo). The fan is naturally at max rev. On a side note, rmclock shows one core throttling down while testing with prime95 at the stock voltage of 1.0v for 1.86ghz, while very rarely for 0.925v. This is a strong indication that the macbook air has a very limited cooling capacity (and that stock 1.86ghz machines without undervolting are crippled). And please don't reply with comments on the sanity of overclocking the mba..