I got the patch from http://www.swallowtail.org/naughty-intel.html

I think the reason the -xP binary doesn't work on your Opteron is because it
might be the Sledgehammer core, which doesn't have sse3 support (Venus core
does though). My Athlon64 is a Venice core, which does include sse3
support.

-John

Nicolas Calimet <pov### [at] freefr> wrote:
> > Although the reason I used it is because the
> > -xP option would give a fatal error (although -axP worked fine) prior to
> > patching.
>
>  But that's expected: -xP will emit SSE3 instructions that are not
> supported by the k8; therefore the program aborts.
>
>  Now, I don't understand why applying this patch would change the
> situation since, in principle, the binary does not contain any sse2/x87
> path (unlike when using -axP).  In fact I just tried to patch a binary
> produced on a k8 using -xP and the resulting binary does not work either,
> producing the same error message at startup.
>  Maybe you did use another patch?
>
>  - NC

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