Hey guys I have an older motherboard MSI 870-G45 running an AMD Phenom II X6 1055T stock speed. I currently have a 4GB kit installed its a Mushkin enhanced silverline 2x2GB kit PC3-10666 1333mhz it runs fine however when I try to use my G.Skill Ripjaws PC3-12800 1600mhz 4x2GB ram kit. It well works with one stick and wont even post with another stick installed. I have no clue what is going on and why only one stick works at a time, it is just a weird issue? Is there some setting I need to change in the bios? Is this ram just not supported because of the speed? I mean if one works why not the other 3 and yes all ram works it was pulled out of my current rig in an upgrade from the 8GB to 16GB of ram.