Hi there, I have Radeon X1900XTX and Catalyst 7.4 for WinXP, and I have noticed that right now with custom profiles ATITool 2.7 b1 is not setting voltages when switching from one profile to another. Yes, I have made sure that profiles contain saved voltages. In fact, the only way I have found to set voltages is to go into ATITool Settings and set them myself. Otherwise they will never move from the default. I have tried with Driver Level Overclocking both on and off, does not work either way.