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i7-4960x rdrand instruction fails

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I found documentation that states rdrand is supported on this processor, but the following routine fails continuously with RAX  and CF being zeroed.

 

top:

     rdrand rax

     jnc top

     ret

 

If it wasn't supported I would think I would get an Invalid Instruction exception and/or it wouldn't zap RAX.

 

I went all through the BIOS, only function that could be disabled was Virtualizatoin(which is enabled).

 

Is something needed to enable rdrand?

 

thanks,


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