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How can I limit Windows 7 x64 to use only one core of one CPU?
I already tried this and rebooted but it seemed to have no effect. Task Manager still shows four columns that were all in use from time to time, and Device Manager still showed all 4 cores. And my BIOS setup does not have any option I can tweak.
(I have an Intel Core i5 520M.)
Silly me -- I had adjusted the setting for Windows 8 instead of Windows 7 in msconfig!
Selecting the correct OS and setting the maximum number of processors definitely works.
Some PCs have a setting in the BIOS setup to disable all but a single core.
Also, if it's just a single program / process that you need to test, you could instead just set the processor affinity of that process. See: How to limit a process to a single CPU core?
You can set the Number of Processors or Cores to be Used in Windows 7 using MSConfig.
You can find the all settings under the Boot tab in System Configuration, click on the Advanced options button.
Check this link [How to Set the Number of Processors or Cores to be Used by Windows 7] for step by step information.
If it does not work then try to do this:
Type bcdedit /set onecpu on on a command prompt
Reboot the system.
When you are done playing, type 2 - Type: bcdedit /set onecpu off and reboot again.
that i got on SuperUser question.
