I have read the same thing Liquid Ice about the P5B but havn't tested it myself. My eVGA 680i will also increase the voltages when set to "Auto" if you manually increase the CPU overclock (the SPP, MCP, FSB, and CPU voltages will all increase when set to "Auto"). I just flashed my P5B to the new 1004 BIOS and decided to set all voltages to lowest value instead of leaving at "Auto" just incase. I'll post back later if I find out that voltages will increase when set to "Auto" if you manually increase CPU speed.