My other pc with the 7970 is ok with about 18 MH/s. But I can't get more than 2 MH/s with my GTX 670... Maybe because of Windows 10 even with 347.52 and cuda 6.5? The pool doesn't even see the worker!
I think 670 should do 8-10 mHashes
Thanks for the info!
I'am now getting 4 MH/s with a fresh install of the latest drivers and cuda 7.5 on WIn10 and the worker is seen by the pool. I've tested a lot of settings and overclock but I can't seem to go much higher than 4.5MH/s. I guess I should try on Win7 or Ubuntu but I don't really want to install a dual boot now.