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CPU for Sun Ultra 40 compatible with Windows 10 64 bits (CMPXCHG16b)?

Hi,

I have solved the problem mentioned in " " (short-circuit due to damaged front USB port, immediately solved by straightening out the pins).

Now, I would like to upgrade my good old Sun Ultra 40 workstation to Windows 10 64 bits (currently, it runs on Windows 7 64 bits). The CPUs (dual AMD Opteron 254) are recognized as not compatible by the Windows 10 installer due to the lack of the CMPXCHG16b instruction.

Is there any CPU that would be compatible with the Sun Ultra 40 motherboard and with Windows 10 64 bits? The highest in the Opteron 2XX series (the 280) seems not to be...

Thank you for any advice!

Maxime