I have. I tested 3 models of HP that we had on campus which are kind of aging. Here's my results in Watts:
HP 6000 Pro SFF - Core2Duo E8400 @ 3GHz -
100% CPU: 70,
Idle: 26,
Sleep: 2-3,
Off: 0-1,
HP 6200 Pro SFF - Core i5 3470 @ 3.2GHz -
100% CPU: 83,
Idle: 31,
Sleep: 2-3,
Off: 0-1,
HP 6300 Pro SFF - Core i5 2400 @ 3.1GHz -
100% CPU: 100,
Idle: 30,
Sleep: 2-3,
Off: 0-1,
It's been a few months now, and I can't remember what I used to max out the CPU. It wasn't SETI @ Home, but it should give you a pretty good approximation. When it was off, it had Wake on LAN enabled, so it still drew some power. But it would fluctuate between 0 and 1.
HP 6000 Pro SFF - Core2Duo E8400 @ 3GHz - 100% CPU: 70, Idle: 26, Sleep: 2-3, Off: 0-1,
HP 6200 Pro SFF - Core i5 3470 @ 3.2GHz - 100% CPU: 83, Idle: 31, Sleep: 2-3, Off: 0-1,
HP 6300 Pro SFF - Core i5 2400 @ 3.1GHz - 100% CPU: 100, Idle: 30, Sleep: 2-3, Off: 0-1,
It's been a few months now, and I can't remember what I used to max out the CPU. It wasn't SETI @ Home, but it should give you a pretty good approximation. When it was off, it had Wake on LAN enabled, so it still drew some power. But it would fluctuate between 0 and 1.