How to: Disabling SpeedStep with Conroe ES Steppings 4 and 5

[freecableguy]

Here it is gentlemen, playing with CPU MSRs can be fun....

Steps:
1) Open CPU-Z so that you can see the active multiplier switch in realtime
2) Open CrystalCPUID -> Function -> MSR Editor
3) Type 0x000001A0 in the MSR Field
4) Click "RDMSD" (read)
5) Copy the upper 32-bits of the EDX resigister to the box below (should be 0x00000060 or similar)
6) Copy the lower 32-bits to the box below (should be 0x63940089 or similar)
7) Change the 3 (as in 0x63940089) to a 1
8) Click WRMSR (write)

You CPU's maximum multiplier (default on XE is 11x) is now set and the CPU will not step down. I see no difference in idle temperatures doing this. Long term affects have not be judged yet as I just did this about 1 hour ago. CPU seems to respond quicker in benchmarks and doesn't show the tendency to step down at the "wrong" time.

Before:



After:



Enjoy!

-FCG