Just wanted to bring this up again because it’s important for people with Core i5 750 processors too.
I spent forever tweaking the BIOS trying to figure out why the Turbo Boost functionality wasn’t working – changing the power plan to Performance from Balanced fixed the problem. Since the i5 750 doesn’t do hyper threading, I don’t care about the SMT parking functionality, so I can’t say if these registry settings help with that or not.
But this is just a heads up for Core i5 750 users. Cheers!