Vendors don't normally brag about slower products but Advanced Micro Devices is making an exception for its latest Opteron 6300 processors, which have a slower clock speed than their predecessors to reduce power consumption. Some AMD customers use its chips in highly virtualized systems, and those types of servers tend to max out their memory and I/O bandwidth before they can make use of all the CPU performance, said Suresh Gopalakrishnan, general manager of AMDs server division.