So I have this strange problem, my PC keeps shutting of when I play a game and I think I know the problem, See I only have 2 gigs of ram on my gpu but my dxdiag tells me I have 6 gigs and the strange thing is my memory clock is up by 2x and I can't under clock it. The Memory Clock speed is at 3600 but I'm trying to get it to 1800 but it only lets me go down by -500Mhz. Are they're any settings I can do on MSI Afterburner to let me underclock it a little further or am I forced to enter my BIOS?