While the Windows 7 Beta 1 client is available in both x86 and x64 versions, Windows Server 2008 R2 is Microsoft's first 64-bit only OS. It also supports up to 256 logical processors, which opens up a whole new world of enterprise-class back-end processing power,” Oliver Rist revealed. “Your existing servers will run faster, too, because Windows Server 2008 R2 takes advantage of the latest CPU architecture enhancements. You'll also get significant power management improvements via features like Core Parking.”