I am currently mining on a GTX 960 at 10Mh/s in Windows 8.1 for fun when not using my PC.  I really want to upgrade to Windows 10 to checkout some new development tools.  I'm afraid my Hash Rate my drop significantly after everything I've read.   Should I hold out on Windows 10 or can I go ahead and just use an older Nvidia driver for my card?  Thanks for any suggestions.