Updated thru app store ok - did not lose sound (ALC1150) or USB3 functionality. Original installation was clean install via clover (3270) and patched for USB3.
Gigabyte GA-Z97X-UD5H; i7-4790K; PNY GTX 760
Also I did not find the "load optimized defaults' in the msi bios as recommended for previous msi boards.
I did set the nv_disable=1 in the boot arguments.