Well maybe you need a much better cpu cooler to enable higher turbo boost or the bios is bad. Maybe there is a newer beta one.
since you meantioned you didn't read what the problem was
enabling turbo boost led to erratic/poor performace, test results varied greatly from one run to the next and all of them were worse then with it off. also the cpu wasn't actually scaling up like it should (thats what micheal had happen any)
Then I played with Turbo, C-State and Eist settings. For the higher turbomodes in windows all C-State options must be enabled. Without turbo behaves like I thought it behaved under linux yesterday and the max multi was 21x (2.8GHz).
Looking at the linux results it seem higher multis where in effect yesterday but the correct frequencies are not reported under /proc/cpuinfo.
With EIST/Turbo and CS off the result looks like 2.66GHz. Once I enable Turbo but leave C-States disabled it looks moore like 2.8GHz and with C-States enabled the frequency should have been 3.2GHz.
Currently I run the first serie again with C-States And C-Satetes+Turbo disabled. Will have to rerun the test with both enabled because the newer bios runs with an slightly higher BCLK (~136MHz vs. ~133MHz).
One of those nas benchmarks (IS.c) cause the system to hang, once during the 955BE test and once during the i5 750 test with C-States disabled.