CMPXCHG8B CPUs in Non-Intel/AMD x86 Compatibles Not Supported

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Article ID: 189988 - View products that this article applies to.
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Computers with x86-based processors that report support for CMPXCHG8B in the response from the CPUID instruction may cause the following blue-screen error message during startup:

STOP 0x0000003e

NOTE: This problem can occur on uniprocessor systems and only occurs on non- Intel and non-AMD x86-based processors.


During the boot process, Windows NT queries the processor for its type and uses that information to adjust its initialization to take advantage of the features that the processor should support. Later, it makes calls to the processor to verify that it does support these specific features. One of the calls is to note the maker of the processor. If the maker is not Intel or AMD, the return value causes Windows NT to assume that the features are not supported by the processor, even through they may be.


To resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
152734 How to Obtain the Latest Windows NT 4.0 Service Pack


Microsoft has confirmed that this is a problem in Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4.


Article ID: 189988 - Last Review: October 26, 2013 - Revision: 3.0
Applies to
  • Microsoft Windows NT Server 4.0 Standard Edition
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