Nice! found a CPU miner for X11 on Core2 Quad Q6600:
cpuminer_multi https://github.com/LucasJones/cpuminer-multi/releases

C:\cpuminer-multi>minerd.exe -a x11 -o stratum+tcp://uswest.wafflepool.com:3331
-u 1HANJQygp3jHuzutceBgMT7wfCgEug6h4L_cpu1 -p d=0.008 --threads 4 -q --no-redirect --no-longpoll --timeout 30
[2014-06-09 15:35:02] Starting Stratum on stratum+tcp://uswest.wafflepool.com:33
31
[2014-06-09 15:35:02] 4 miner threads started, using 'x11' algorithm.
[2014-06-09 15:35:03] Stratum detected new block
[2014-06-09 15:35:32] Stratum detected new block
[2014-06-09 15:36:31] Stratum detected new block
[2014-06-09 15:36:59] Stratum detected new block
[2014-06-09 15:37:15] Stratum detected new block
[2014-06-09 15:38:43] Stratum detected new block
[2014-06-09 15:39:03] Stratum detected new block
[2014-06-09 15:39:14] accepted: 1/1 (100.00%), 83.43 khash/s (yay!!!)

Q6600 doing 83.5KHs
E4300 doing 30.4KHs
E6300 doing 31.3KHs