I've downloaded ccminer 2.2.4 from here https://github.com/tpruvot/ccminer/releases and note in the comments about Cuda 9.1 and in the earlier releases, Cuda 9.

I'm unclear - is there any performance improvement in installing Cuda 9.x and then running ccminer?

I'm new to mining and so far have only been running ccminer - I've not installed Cuda. I'm on Windows 10 with 3 * Gigabyte 1070's.

Thanks.

I added keccak-c to ccminer alexis and compiled a windows binary.
Hashrate improvements are around 20% to the official ccminer.

Feel free to use it: https://github.com/cornz/ccminer
Download can be found in the releases.

If you don't trust it, compile it yourself. Code is opensource.