IB temperatures only get out of hand if u are trying to achieve very high overclocks...like past 4.4GHz.
For moderate OC's the temp's won't be an issue. Even if u clock it lower, IB has nearly a 5% IPC advantage over SB to make up for it:)
so 5% is the difference between IB & SB?
what is the max oc can reach without ant temp. issues?