Windows NT 4.0 Can't Install With SSE4!

Microsoft Windows nt 4.0 workstation
September 8, 2010 at 19:00:04
Specs: Windows XP, Pentium 4 531\1 Gb. DDR-400
Ever tried to run Windows NT 4 on a computer with a processor that conains SSE4? I was playing around with Bochs, a processor emulator for windows, and I learned that Windows NT 4 can't boot with SSE4 enabled.

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September 8, 2010 at 19:12:40
If you were trying to emulate SSE4 on a P4, that's probably why it failed.

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September 21, 2010 at 00:41:32
I beg to differ. There's no reason you can't emulate SSE4 on a Pentium 4, other than counterproductive performance. While a bug in the SSE4 emulation code is possible, I suspect another problem is more likely, such as CPUID issues with newer processors and Windows NT. Many BIOSs on real computers have compatibility hacks to bypass this problem, and from what I can see in the Bochs documentation, there is a similar option:


Determine whether to limit maximum CPUID function to 3. This mode is required to workaround WinNT installation and boot issues."

Specifying a processor with SSE4 probably implies a processor with a higher CPUID level, and if the above fix isn't turned on, the processor will report information that Windows NT can't understand.

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