Hi what should I do?

Got a good PC yesterday I tried to run few game but they seem to lag a lot and freeze for few seconds

SSBB drops to 50 a lot
MK Wii runs at 35-40 FPS lol
Metroid prime at 40 FPS as well -_-

Anyways these are my specs

CPU - I7 4770K
GPU - GIGABYTE GTX770 OC
Motherboard - Z87-A
16GB RAM 1600
hydro 212 fan

BTW am using rev 3.5 1565 x64
is it good enough?

:/ is there's anyway to improve the performance and make those games run smoothly?