For both of you that jumped on the new AMD Bulldozer CPU and are disappointed in the performance while running Windows 7 or Server 2008R2, there is a hotfix from Microsoft to improve the performance of your system. Grab it if you need it!
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.