These boxes aren't called troll boxes for no reason!
CUDA 6.0 RC is available. You have to be a registered developer though
https://developer.nvidia.com/usercompile cudaminer and compare results. the T kernel for keccak might be interesting to check out.
In CUDA 5.5 it gives a rather shocking performance.
Christian
Using CUDA 6.0 with my GeForce GT 650M (1024MB) on OS X (MacBook) seems to have reduced my performance. With 5.5 I was seeing 70 - 75 Kh/s. With 6.0 I am seeing 45 - 50 Kh/s.
With both versions I have been using K4x32 as my configuration. Any suggestions on other configuration options that might work better with 6.0?
Thanks!