download and run cpu-z. Check to see if the multiplier is at 31 or better.
What are your temperatures? Realtemp will tell.
If you have not mounted your cpu cooler properly, the cpu temperature will rise, and the cpu will lower it's multiplier to protect itself.
Pushpins are notoriously difficult to get on properly. With the pc shut down, try to wiggle it. Is it on solid? Are all 4 of the pushpins through the motherboard and locked?
You have to look at the back of the motherboard to verify this.