OK, here are some hard numbers for you to chew on, c6. These are checked with my kill-a-watt on each individual rig. Since I run Rosetta, I have no idle time; everything is always at 100% cpu load. And for simulating gpu crunching in either F@H or Seti, I do a separate measure with Rosetta running plus Furmark running in 640X 480 windowed mode. That loads the gpu, but not as high as full screen mode and will more simulate a gpu crunching than running Furmark at max. And I will update this as I get time with the rest of my systems; just have 2 done right now.
QX9650 system@4.0, has a 9800GTX+ (55nm gpu) vid card, psu-Corsair VX550
Powered down, just plugged into the wall - 2.5 watts, .2 pf
Powered up, running Rosetta - 250 watts, .99 pf
Powered up, running Rosetta & windowed Furmark - 370 watts, .99 pf
i7 980X@4.0, has a Thermi 570GTX vid card, psu-Seasonic X-650
Powered down, just plugged into wall - 8 watts, .45 pf
Powered up, running Rosetta - 430 watts, .99 pf
Powered up, running Rosetta & windowed Furmark - 500 watts, .99 pf
i7 2600K@4.5, has a 9800GTX (old version .65 nm gpu), psu-BFG ES800
Powered down, just plugged into wall - 1.7 watts, .16 pf
Powered up, running Rosetta - 215 watts, 1.0 pf
Powered up, running Rosetta & windowed Furmark - 315 watts, .99 pf
i7 930@4.0, has old 7900GTX vid card that can't do gpu work, psu-Cougar S700
Powered down, just plugged into wall - 1.5 watts, .12 pf
Powered up, running Rosetta - 330 watts, .99 pf
Mac Mini@1.83, bone azz stock
Powered down, just plugged into wall - 1 watt, .23 pf
Powered up, running Rosetta - 43 watts, .99 pf
EDIT: Additional info added]
Window AC I have to run in computer room to keep these machines cooled down.
Fan running only - 165 watts
When compressor is on actively cooling (fan on high) - 1270-1285 watts