Hey, Bulldozer fans: if you’re regular readers of the site you may remember that we told you a few months back that AMD expects to see better performance for its FX chips in Windows 8, as the company claimed that Windows 7 didn’t handle simultaneous multithreading efficiently. Turns out they were right! Kind of. Windows 7 didn’t handle simultaneous multithreading efficiently, but you still might not see a performance jump in Windows 8 – because today, Microsoft released a hotfix to correct the problem and help Bulldozers run better on Windows 7 and Windows Server 2008 R2.
From the hotfix page: This article introduces an update that optimizes the performance of AMD Bulldozer CPUs that are used by Windows 7-based or Windows Server 2008 R2-based computers. Currently, the performance of AMD Bulldozer CPUs is slower than expected. This behavior occurs because the threading logic in Windows 7 and in Windows Server 2008 R2 is not optimized to use the Simultaneous Multithreading (SMT) scheduling feature. This feature was introduced in the Bulldozer family of AMD CPUs.
So what will the hotfix improve? Again, the web page provides the answer. After you install this hotfix, Windows 7 and Windows Server 2008 R2 fully support AMD Bulldozer CPUs. Therefore, the CPUs operate at the expected performance level.