Originally Posted by
003
No, you are both incorrect. I am well aware of how to use the 21x multiplier. I have it keyed in directly for the CPU Ratio in the Ai Tweaker section of the BIOS.
I have disabled SpeedStep, C1E, CPU TM Function and Turbo Boost.
Under idle conditions, and moderate to heavy loads, the multiplier remains at 21x as it should. However, under extremely heavy loads, such as linpack in 64-bit mode with the maximum amount of memory being used, the multiplier drops to 20x. The drop shows up in RealTemp and CPU-z and Everest.
Prime95 does not cause the multiplier to drop to 20x. So far, linpack (using LinX) is the only load that causes it to drop that I have found. And not surprisingly, linpack also gets the temperature a good bit hotter than Prime95 as well.
This is directly related to the TDP and current limitations on the non-EE i7 CPUs. The Asus BIOS does not properly disable them, so when the CPU is loaded heavily enough and set at a high enough voltage and clock speed, the multiplier will drop.
Set your P6T Deluxe to 191 bclock with the 21x multiplier and use 1.4125 core voltage, and load the CPU with LinX using the maximum amount of memory, and monitor the multiplier with the latest version of RealTemp.
For me, it drops almost immediately after LinX initiates the full load (takes a few seconds after you hit start).