Windows XP Home does not support more than one processor, however. Multiple cores - yes. Multiple processors - no. Windows XP Professional supports and automatically adjusts for up to two physical processors and multiple cores. Windows XP Professional does not support more than two physical processors. Two processors - yes. Multiple cores per processor - yes.
Windows 7 has similar limitations per edition of Windows 7. Was this reply helpful? Yes No. Problems arise when the Windows OS then never re-enables all the cores. If you have experienced a drastic slowdown in system performance, this could be your quick fix. In some circumstances Windows 7 will disable certain cores. Often this is to save in power consumption or to assist older programs in working correctly. Problems arise when the OS disables a core in error or has difficulty enabling the core again.
Go to Start and type msconfig. Run the program as Administrator. Check the box labeled Number of processors. Pick from the list how many cores you want to run. This is because Windows is configured to utilize all cores whenever a program has the ability to use them. In Windows Vista, 7 and 8, the multi-core setting is accessed through the same msconfig process as described above for Windows It is also possible in Windows 7 and 8 to set processor affinity, that is, to tell the operating system to use a particular core for a particular program.
You may notice that twice as many cores are listed than you have. This is because hyperthreading effectively doubles your cores, with four real and four virtual. If you want to know how many physical cores your processor has try this:. There is a useful batch file you can create that can force processor affinity for particular programs.
This page on the Microsoft Developer website has a full list of affinities. There is actually some argument about this, although there is a pretty strong consensus among experts that you should use all your cores. There are essentially two points the anti-corers hit on. One is that reducing the power consumption from laptops and PCs would reduce electrical usage elsewhere.
The other argument makes a little more sense, and has to do with laptop battery life.
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