I see, and what cudaminer version are you running?
The latest one Christian posted, x64 for scrypt-jane (seems a bit faster than x86 for me).
hmm, it seems the forum hasn't been updating me when new replies are put on, i've missed a lot
Ouch!

I have this topic bookmarked in a way that always shows me the first unread post:
https://bitcointalk.org/index.php?topic=167229.new#new