Options marked "default" in UI is the best choice in most cases but their could be really heavy, especially for 1080p.
So SVP installer makes a quick assessment of the hardware speed and chooses one of predefined profiles sets - from "level 1" (minimum system like Core2Duo 2 GHz) to "level 5" (i7-2600 and above).
You can always change default profiles set with "Reset profiles" start menu item.