This article was previously published under Q327809
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Certain programs (for example, games) may not run correctly on hyper-threaded computers, dual-processor computers, or single proc computers in which the CPU speed is greater than 2 gigahertz (GHz).
This problem may occur if the program that you are running uses the QueryPerformanceCounter and QueryPerformanceFrequency functions to generate timecode but uses only the lower 32 bits of the result and assumes that this is a signed number. On hyper-threaded computers, dual-processor computers, or single proc computers in which the CPU speed is greater than 2 GHz, the output may be incorrectly interpreted by certain programs, and as a result, the program may not run correctly or may stop responding.
To resolve this issue, contact the manufacturer of the program that does not run correctly to determine whether there is an update available to address this issue.
Microsoft has confirmed that this is a problem in programs that make erroneous assumptions about the QueryPerformanceCounter and QueryPerformanceFrequency output.
On certain computers, the result returned by QueryPerformanceFrequency will be the clock speed of the CPU. On a computer with a processor running faster than 2.1 GHz, this frequency value requires at least 32 bits of precision. Some programs work with the result of QueryPerformanceFrequency as a signed integer value, which has only 31 bits of precision and a sign flag. These programs behave incorrectly on these faster CPUs. To avoid this problem, programs must use all 64 bits returned from both QueryPerformanceFrequency and QueryPerformanceCounter.
For more information about hyper-threading technology, visit the following Intel Web site:
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