Power gating is probably only meant for stock, I can't see BD clocking to 4.6GHz on all cores, then power gating to 5Ghz, unless 5Ghz was achievable in the first place.
I just want to see the single thread per clock performance vs sandy, then compare max overclocks.
Everything else (including power gating) is for non overclockers.
Even for "overclockers", I can imagine many a situation where you can't cool all cores at 5GHz+ (@1.48v for example), but you are fine if you set all cores at 4.6GHz (1.4v) then, thanks to power gating, boost to 5.2GHz (for example) at the same voltage. The only required option in the BIOS is the ability to increase the "TDP" TurboCORE is using for a reference. Also even if you have a great cooling setup, there may be overclockers that want to get near 5GHz for games, but don't want to run at the vcore required to have all 8 or 6 cores stable at those clocks 24/7.
Just because TurboCORE is useless to overclocker in it current form does not mean we should assume that it will be useless on Bulldozer.