i7-4770 (4GB,1 Chip) - 121 hpm (cpm??)
i7-3770 (8GB,2 Chip) - 132 hpm
Core 2 Duo - T6600 - 21 hpm
Interesting that the i7-3770 should outperform the i7-4770, I put this down to its memory being spread out over 2 chips.
Older machines achieve a much lower cpm obviously, but I think at reasonable power usage levels - so hoping we'll see large pools of old computers from individual miners, rather than capital intensive commercial mining.