560Ti 900 core clock:
2013-04-09: [2013-04-11 03:21:01] GPU #0: 107.78 khash/s with configuration 32x4
2013-04-10: [2013-04-11 03:32:00] GPU #0: 138.84 khash/s with configuration 64x2
Sweeet!
2013-04-14: [2013-04-15 01:45:32] GPU #0: 146.28 khash/s with configuration 16x8
And no crash on ctrl-c, awesome!
But if you ctrl-c during the auto-tuning, it waits for the auto tuning to finish before shutting down.
The question is, how much further can you take this?

Google Doc page to track GPU outputs.
credit goes to Cairpre

Where?