I'm taking performance measurements of several bits of code. How can I disable SpeedStep on my Core i7 CPU so that the CPU clock speed is constant? I'm not trying to overclock here, and since SpeedStep only throttles up when it's safe (given the CPU temperature) to do so, I expect turning off SpeedStep will throttle it down to the minimum. That's fine. I just need it constant.
Setting power options to High Performance does not disable SpeedStep.
I am using a Dell Studio 1558 if that's relevant.