According to Microsoft, Windows Server 2008 R2 and Hyper-V are a perfect match for the new CPUs.
server, Windows Server 2008, Magny-Cours, Opteron 6000
The Opteron 6000 series, the formal name for Magny-Cours has four DDR3 memory channels to the new Intel Xeon 5600's three channels.
server, CPU, AMD, Magny-Cours, Opteron 6000
The company has extended support for AMD Opteron processors across its entire design-to-order server portfolio.
server, server hardware, AMD, SGI, Opteron 6000