Combs' blog only addresses virtualization. The fact that his MBP booted indicates that 8 gb, in and of itself, is not a problem for the MBP (and presumably OS X, since Mac Pros can address more than 8 gb). This is different than, for example, the first gen Intel-based iMacs, Mac Minis, MacBooks and MacBook Pros where sticking more than 2 gigs would prevent the computer from even booting. Apple still claims the Mini can only take 2 gb of RAM, when those of us who own them know they can address more than 3 gb.