I just installed my new opteron 170 to replace my old 3000+. It seems by reading the forums that I don't need any drivers, but I came across this on the amd site - has anyone tried it?:
AMD Tech driver
AMD Opteron? Processor with AMD PowerNow!? Technology Driver for Windows XP and Windows Server 2003 Version (x86 and x64 exe) 1.3.2.16 - Allows the system to automatically adjust the CPU speed, voltage and power combination that match the instantaneous user performance need. Download this Setup Installation program (EXE) to automatically update all the files necessary for installation. This package is recommended for users whom desire a graphical user interface for installation. This .EXE driver is a user friendly localized software installation of the driver designed for end-users. This driver supports Single- and Dual-Core AMD Opteron? processors on Windows XP SP2, Windows 2003 SP1 x84 and x64 Editions.
AMD Tech driver
AMD Opteron? Processor with AMD PowerNow!? Technology Driver for Windows XP and Windows Server 2003 Version (x86 and x64 exe) 1.3.2.16 - Allows the system to automatically adjust the CPU speed, voltage and power combination that match the instantaneous user performance need. Download this Setup Installation program (EXE) to automatically update all the files necessary for installation. This package is recommended for users whom desire a graphical user interface for installation. This .EXE driver is a user friendly localized software installation of the driver designed for end-users. This driver supports Single- and Dual-Core AMD Opteron? processors on Windows XP SP2, Windows 2003 SP1 x84 and x64 Editions.