-----Original Message----- From: Kai Chen [mailto:kch670@eecs.northwestern.edu] Sent: Wednesday, May 13, 2009 12:25 PM To: nanog@merit.edu Subject: questions about DVFS in saving energy Hi, could anyone here have some idea of the following questions about Dynamic Voltage/Frequency Scaling techniques used for energy efficiency, or please give a pointer that I can trace, 1) how many servers in the market support this technique? 2) how many voltages/frequencies can the servers support? 3) What's the transition time and cost (power) between these voltages/frequencies? Thanks, -Kai ________________________________________________________________________ ____________________________________ My experience with the AMD HE CPUs has been that the scaling breaks Win2K3, and any virtualized environments.