Updated to 10.9.5 without issue here.
GA-B85-HD3, GTX 660Ti, i5-4690S, 16GB RAM, Samsung EVO SSD.
Selected "OS X Default Drivers"
Installed Combo update (had 10.9.4, updated to 10.9.5)
Rebooted
Ran MultiBeast 6.4.2, installed TRIM
Ran MultiBeast 6.2.1, installed Audio (ALC892) to fix...