"It is not a utility bug, because Everest program showed the same exact CPU frequency, although it “adjusted” the base frequency accordingly. For the above described example, the program indicated 177MHz base frequency, which gives 3724MHz CPU frequency if multiplied by 21."

It is not the FSB or BCLK frequency that is changing. When you approach the thermal limits of a Core i7 CPU, Turbo mode will start cycling on and off. Intel recommends that software should compute the average multiplier over a 1 second interval using high performance timers within the CPU.

http://download.intel.com...essor/applnots/320354.pdf

This is a tedious process so most software doesn't bother. My i7 Turbo software calculates the multiplier using Intel's recommend method. At full load it will very accurately report the average multiplier and this value does not move. As soon as it starts to report a lower number at full load, it is a sure sign that Turbo mode is starting to cycle on and off. The more Turbo cycles on and off, the more the average multiplier will drop. Sooner or later CPU-Z will show this as 20.5 for a 920 CPU.

Next time you are testing a motherboard hopefully you can include a screen shot of the i7 Turbo tool while running LinX. It is the most accurate way to monitor your multiplier at full load. This tool can also be used to turn off Turbo mode from within Windows if you have previously enabled it in the bios.

http://www.fileden.com/fi...008/3/3/1794507/Turbo.zip

Thanks
Kevin Glynn

Agree. Please use RealTemp and uncle's Turbo tool. Both are heavily modified/tested for i7.
Take a look at this test http://www.xtremesystems....778726&postcount=3488 to see how his tools performs in odd situations.