Default Cuda installed in nvOC is 9.2
I think if you use the pre-compiled version from GitHub, it uses cuda from nvidia 410 driver, which is cuda 10
If recompile it, it should use cuda 9.2 from nvOC
Test both see which one gives better hash rate.
No, i compiled Xmr-stak 2.10.0 like my "how to" described last saturday.
I manually compiled it after a git clone in src folder of xmr-stak.