Alineware M17xR3 Upgraded from 560m to 780m (slow Games)

Hello guys i upgraded my gpu all the process was done > A12 unlocked bios, disabled the integrated graphics >set display to PEG>Disable the Integrated sound card

i tried
326.29
340.52
344.11

all modded and the games are very SLOW!!

any idea?

P.s: windows 7

Alineware M17xR3 Upgraded from 560m to 780m (slow Games)