Well, with the entire P6T lineup, once you pass a certain threshold, which is cumulative of a bunch of factors, the turbo multiplier will get throttled down one step during load. This usually happens when you're over 4.0 ghz. So for example, if you have a i7 920 and you do 21x191 for 4.011 ghz, it might drop down to 20x191 for 3.82 ghz during load. It's a specification from Intel that Asus seems so adamant about, on the other hand, all other board makers don't implement this feature. It's not something you can switch off from bios either. For a premium chipset board, I would expect it to be unrestricted of potential. Regardless, it can still be adequate depending on your goals. There's the possibility of using the 20x multiplier and putting more strain on higher bclk, vtt, and ioh. Or, if you get a P6T Deluxe V1 or V2, there are modified unofficial test bioses made by Asus' bios engineers that have this removed. You can check on XS forums in the P6T Deluxe thread for links on downloading. To my knowledge, they don't have one released for the P6TD deluxe and never plan on any official public releases for any of the P6T series. *The rampage series aren't effected by this - so to their claim of "superior design" or that motherboard series, which is total bs when they can just release a bios to solve the problem.
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