How about iMessage fix?
redo your DSDT edit with Multibeast and that will sort your HDMI audio out i did with my Z77N-WIFI and it worked after the 10.9.3no hdmi audio after updated to 10.9.3.
i have the same specs as yours and yes it will fly through the update for you just need do reinstall the ALC887 kexts and Trim Enabler if your using a SSD drive and you'll be fine mine worked 100%howdy folks. I have a GA-Z77-DS3H (F9), i7 3770, 8gb ram, gigabyte GT640, siba firewire card, TP-LINK TL-WDN4800 WiFi card, anybody have a similar build and have successfully installed 10.9.3?
make sure you have edited your boot.plist with GraphicsEnabler=NoEVGA Geforce GTX 660ti 2GB
Gigabyte Z77X-UP5 TH
Intel i7-3770K 3,5GHz
the finder seams slow now. expose and finder-transitions are juddering. i had no problems with 10.9.2
try this https://discussions.apple.com/thread/5541299?start=90&tstart=0Followed instructions and all went well, Z77X-UP5TH, GTX 760...but I do have one odd problem, if the computer puts itself to sleep for any length of time, upon wake there is no sound until i reboot the computer.Working on it....anyone else have this??