Corsair vengeance ram crashing and lagging HELP!!!

VeTeRen ThoR

Honorable
Jun 19, 2013
188
0
10,690
Hey guys i recently bought a new gaming rig with following specs:

750W thermaltake smart power psu

gigabyte H87M-HD3 Mobo

Intel i5 4670 haswell non k

gigabyte GTX 770 OC 2GB

2 x 4GB Corsair vengeance ram running at 1333 standard speed now and its suppose to run at 1600mhz.

1TB seagtae barracuda hdd

and 6 cooling case fans.

k550 chassis coolermaster


Now i tried setting the speed of the ram to 1600mhz and XMP(Xtreme memory profile) but when i save changes and boot....the pc lags trimendously and even when i open any prgram it sometimes wont open and it will restart automatically the pc... the voltage is 1.5V and i tried setting it higher but still nothing...please help! i also tried setting the things on a program i received with the cd of my mobo... app center. so what else can i do.. i am a gamer and would love to have the speed higer :) tnx guys!