May 10, 2024
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May 10, 2024
Windows 8.1 Top Forum Contributors:
Windows 8.1 refuses to install on AMD Opteron because it don't support CMPXCHG16b (CompareExchange128).
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Hi Elad,
1. How are you trying to install Windows 8.1?
2. Are you trying to install Windows 8.1 on VirtualBox?
3. How did you install Windows 8 on the computer?
4. What is the model of the computer and the processor?
Please provide more information to assist you better.
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i'm having the exact same problem. opteron 170, socket 939.
I figured MS would remove this limitation by the RTM stage?!?
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Hi,
Thanks for your reply!
Sorry for omitting basic info. Here it is:
1. Trying with USB drive or mounting the ISO. Same results. The update doesn't show up in the store.
2. Nope. Trying to install regularly.
3. I Installed Windows 8 From USB drive. Fresh install.
4. DIY PC, processor is AMD Opteron 185.
As the 2 replies above added, all AMD Athlon 64, FX, Opteron 1xx, 2xx and 8xx (as far as I could check) don't have CMPXCHG16b instruction set and therefor do not support Windows 8.1. Again, Windows 8 works perfectly.
In all versions up to Windows 8 (apparently) there was a workaround by Microsoft that was implemented in the OS (Software solution) to support 16bit compare (CMPXCHG16b) instruction set.
I wanted to know why it was omitted from Windows 8.1 and what are the benefits of removing such workaround.
I was looking for some blog post, a KB article, something to ease my mind.
Of course those systems we are using are 8 years old by now and dropping support for them was an inevitable move that was bound to happen some day. I just didn't expect it do come with a minor version upgrade!
Thanks!
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Update: I tried now Windows Server 2012 R2 and it didn't have this restriction.
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Actually I didn't install it yet, just ran the installer.
It didn't show the same error as Windows 8.1 did.
Windows 2012 R2 comes only in 64 bits version...
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yup i can confirm.Actually I didn't install it yet, just ran the installer.
It didn't show the same error as Windows 8.1 did.
Windows 2012 R2 comes only in 64 bits version...
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Question Info
Last updated May 4, 2021 Views 9,216 Applies to: