As i have said before the main features of sandy bridge as a whole is turbo and power saving. The high end sandy bridge will have better c2c execution than the current gulftown but that is not the whole plan. Imagine a bloomfield with a turbo like you find on the lynfield and to top it of the benefits of the new system agent.

I cant stress enough the importance of system agent and another monitoring system in sandy bridge and the future cpu's.