Noticed that a Q6600 was almost as fast as a Q8400 and a Phenom II 940 was slightly faster (all native):

c4cw_ target01_ 047317494_ 0-- Q6600 Valid 24/08/10 04:01:10 24/08/10 14:14:30 2.20 32.9 / 39.9
c4cw_ target01_ 042478067_ 0-- Q6600 Valid 24/08/10 02:50:14 24/08/10 14:15:47 2.19 32.8 / 39.8

c4cw_ target01_ 037303476_ 0-- q8400 Valid 24/08/10 01:33:09 24/08/10 05:21:04 2.21 47.1 / 40.4
c4cw_ target01_ 041735792_ 0-- q8400 Valid 24/08/10 02:56:06 24/08/10 06:24:18 2.16 46.0 / 41.0

c4cw_ target01_ 017003263_ 0-- Ph940 Valid 23/08/10 20:40:55 24/08/10 07:39:38 2.13 43.1 / 39.9
c4cw_ target01_ 017865957_ 0-- Ph940 Valid 23/08/10 20:41:18 24/08/10 09:34:58 2.13 43.1 / 40.1

I'm yet so see any on my i7, but the 2GHz Core 2 Duo's and 2GHz dual Core Athlons get through them in about 3.4h:
c4cw_ target01_ 013155749_ 0-- C Duo Valid 23/08/10 19:48:49 24/08/10 17:10:52 3.33 35.0 / 40.1
c4cw_ target01_ 069875932_ 0-- Athlon Valid 24/08/10 08:39:53 24/08/10 12:40:47 3.46 43.2 / 40.3

A bit surprised to see 8 tasks in PV.

c4cw_ target01_ 101275437_ 0-- Athlon Pending Validation 24/08/10 13:32:18 25/08/10 07:20:04 3.41 35.7 / 0.0
c4cw_ target01_ 071436488_ 0-- Q6600 Pending Validation 24/08/10 08:41:59 25/08/10 05:50:59 2.22 33.2 / 0.0
c4cw_ target01_ 070154785_ 0-- Q6600 Pending Validation 24/08/10 08:28:58 25/08/10 05:37:08 2.19 32.7 / 0.0
c4cw_ target01_ 070882707_ 0-- Q6600 Pending Validation 24/08/10 08:28:37 25/08/10 05:37:08 2.21 33.1 / 0.0
c4cw_ target01_ 017313778_ 0-- Ph940 Pending Validation 23/08/10 20:41:18 25/08/10 05:38:58 2.18 44.1 / 0.0
c4cw_ target01_ 017491288_ 0-- Ph940 Pending Validation 23/08/10 20:41:18 25/08/10 05:39:30 2.17 44.0 / 0.0
c4cw_ target01_ 017493164_ 0-- Ph940 Pending Validation 23/08/10 20:41:18 25/08/10 06:08:42 2.17 44.0 / 0.0
c4cw_ target01_ 016232690_ 0-- Q6600 Pending Validation 23/08/10 20:34:50 25/08/10 05:37:08 2.20 32.9 / 0.0