...
550Ti
Linux kernel-3.11 x86_64 cudatoolkit-5.5 90-92 kH
Win7x64 72-76 kH
Aha! It's all in the settings...
Using the following:
cudaminer -i 0
-C 1 -H 1 -o stratum.... -O ....
--- the result is
GPU #0: GeForce GTX 550 Ti, 313344 hashes, 94.62 khash/s
accepted: 35/35 (100.00%), 94.62 khash/s (yay!!!)
To get this result, I also had to stop mining on the CPU, since CPU usage is over 50% of 2 cores with that setup. My setup is a GV-N550OC-1GI at its factory overclock running on a lowly AMD 5200+ / Asus M2AVM / 6GB. (Ubuntu 13.04 with the kernel 3.12 .DEBs stolen from "trusty"'s archive)