I've been trying out the 1.3a beta. It's about 3% slower on my Radeon HD 6870 with the same settings than running phoenix directly, but I'm not sure why. Also, it seems to go to sleep when my PC is running the screen saver. My reported hashrate from the server drops way down, and when I come back from screensaver the OSD reads "Restarting...". It's possible that the underlying phoenix bug is biting me. Perhaps the GUI doesn't properly detect idleness when the screensaver is running?