Hmmm, new I7 just tested running 100% and drawing 330@the wall as opposed to dual core 939 @ 220W on 246V. Same config, same software but added a 4850ATI instead of a 1600. So 4 core as opposed to 2, plus new psu and running 4 cores, 2 threads per core= extra 110W. Idle is 145W 180W, just about a few more than 939.Not bad, quite pleased and psu is running at max efficiency according to the manufacturer graphs. Just wish we had US power charges instead of UK but I did a good fixed 5 year deal 2 years ago so not too bad either. But multiply that by 4 rigs and it starts getting expensive.
Like an ol` 8086, slow but serviceable.
One advantage of old age...nobody can tell you how much cake you can eat