A shame really that nV won't even let the AIBs differentiate their products by offering voltage control. NV's hard stance this generation seems odd given that they never had an issue with this for 10+ years of GPUs, but now it is not allowed? All those fancy after-market coolers and expensive PCB components don't amount to much if you can't overvolt the product without a physical volt-mod.
Let's hope GTX700 and later series allow for voltage control or this seriously undermines the enthusiast market, forcing people to spend $ for the faster SKUs (like charging $100 for GTX680). I am hoping AMD retains voltage control at least so we have 1 good option for overclockers. If NV wants to prevent overclocking, they should have at least considered "K" series GTX600 cards with full voltage control for $30-40 extra.