Hi Dave,
I did run across the information about seperate wu's for different platforms (gpu, cpu,...).
The run time required for the PS3 wu has gone down a little since I started. Maybe due to the loss of "cpu overhead", once the PS3 goes into "screensaver mode"? Or maybe just recalculating benchmarks? I dunno.
More info: 122 watts (screensaver on) and ~100 F (~38 C) exhaust fan output...(it's ~67 F (~19.5 C) in my house)