Yup, mine's running comfortably at 3Ghz with 30-40° under load. Make sure you have the recent one (G0), as the older one is liable to burst into flames (Well, not really. But the new one has much more headroom)
Just experiment with slight increases, testing with Prime95 (4 needed, for each core) for an hour after every say 0.5Ghz increase (this is up to you though, but that's how I found my maximum clock). If it's unstable at that, drop it down and try again. It's a fairly time consuming process, but it can give a great increase. It's given me 20% more CPU performance
The top part is if someone else buys you a license I think, and you'll receive the code to put in. By going with the second (or first, if you just want S1) option here it automatically unlocks your account. Then you set a password (or maybe with the new system you can keep your demo account password, not sure), and go to LFS and enter your username and password.