Keep an eye on the calculated multiplier while your CPU is at full load. It should be steady at 21.000 and the standard deviation below it should be close to 0.000 which shows that all threads are reporting the same thing.

For accurate results, I suggest turning off any software that monitors motherboard voltages. On some motherboards, this can cause inaccurate results.
I like OCCT but when testing, try running LinX or Prime95 Small FFTs to keep it simple. RealTemp, CPU-Z and Core Temp don't seem to cause any issues with i7 Turbo. OCCT might be OK too but I haven't seen any testing of it yet.

This post in the P6T thread has a link to the 0006 bios if you need it.
http://www.xtremesystems.org/forums/...&postcount=991

i7 Turbo 6.2
http://www.fileden.com/files/2008/3/3/1794507/Turbo.zip

Use i7 Turbo V8. It's similar to the original but shows the calculated multiplier for each thread. At full load these should all be consistent at 21.000.