MS Hot Fix Updates for AMD FX CPUs
Here’s what you can do to update your version of Windows 7:
1) Download the scheduler update (KB2645594) and install. This will tell the scheduler that your AMD FX processor contains dual-core modules (in fact this is similar to the SMT path that the other guys use). In essence, threads 1-4 now get assigned to their own module first.
An update is available for computers that have an AMD FX, an AMD Opteron 4200, or an AMD Opteron 6200 series processor installed and that are running Windows 7 or Windows Server 2008 R2
2) Download the core parking scheduler update (KB2646060) and install. This will prevent Windows 7 shutting down unused cores prematurely when there are threads to be assigned (there’s a performance penalty parking and then un-parking a core).
An update that selectively disables the Core Parking feature in Windows 7 or in Windows Server 2008 R2 is available
Thanks to realneil for providing me with this info.