Opteron steppings

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Summary: B3 and higher steppings are desirable. Apparently Linux can work around the TLB bug, but AMD advised vendors to ship a permanently-enabled BIOS workaround. The BIOS workaround is about a 10% performance hit as I recall.

If the code ends with a GH, it's a B3. If GD, it's B2.

A list: http://www.cpu-world.com/CPUs/K10/TYPE-Third%20Generation%20Opteron.html

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