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Realistically though, you don't need any updated microcode to mitigate Spectre. http://developer.amd.com/wordpress/media/2013/12/Managing-Speculation-on-AMD-Processors.pdf …
Variant 1 requires code fixes. Even newer CPUs or microcode aren't going to fix that one in *all* cases. Variant 2 can be worked around with compiler patches but having the microcode fix means you can use existing binaries and may be faster in *some* microarchitectures.
