I successfully upgraded my el capitan to sierra look my geekbench 4 scores. It seems windows have better bench scores but still work fine .. for my device sound and nvidia drivers did not worked ... for nvidia drivers just go to systempreefrences nvidia and check for updates after update its done.. for sound I used voodoo driver 2.8.8 from that link https://sourceforge.net/projects/voodoohda/ .... That driver installed both rear and front panel and also hdmı sound drivers which for my monitor and works well...