Greets!
I've been testing cudaMiner for few days now and I thought I'd share the results of my 560 Ti 448. It's currently running core at 930 and memory at 2100. Temperature is around 75C - 77C and stability seems OK (core @ 940 was unstable). So I'm currently getting 268 - 286 khash/s with:
-H 1 -l F28x8 -C 1 -i 1 -m 1
F28x8 is giving slightly better results than F14x16
I ordered an ATI card yesterday and it will be interesting to see the performance difference.