Hi guys, my timing is no problem at all while I have rtss locked my game to 80, if I turn off rtss which gives more pressure to my ram, my system starts shut down, what could possibly be the cause of my issue?? Timing to tight or not enough voltage?

I did not do TM5 but going straight to the game since some timing are passing tests but giving stutters in game.

My cpu is 149hx, P49, E36, Hynix 24*2 ram