Update via combo installer went smoothly as expected. Sound driver reinstalled with Multibeast.
GA-Z68AP3 rev. 2 UEFI with Intel i3-2120 3,33 Ghz, Geforce GT 640 2048, 8GB RAM 1333, DVI 20" Cinema Display,
Belkin Bluetooth, Firewire, int. 1TB HDD, ext. USB3 HDD for Time Machine.
Magic mouse...