I have a dell optiplex 790 motherboard only rated up to 1333mhz RAM. I was running 8GB of 1600mhz RAM (four 2GB RAM modules). My pc posted and ran perfectly before my RAM upgrade. The memory was underclocking at 1067mhz So I decided to purchase a 16GB 1600mhz 4 stick RAM kit. I put all 4 sticks into all 4 DIMM slots and the pc didn’t post. I decided to troubleshoot and found that only 1 stick of ram worked. The pc posted with that 1 stick of ram and I saw that it was running at 1333mhz. I also tested with my old RAM to make sure it wasn’t the motherboard. What I found out was that if the RAM is good, the pc usually power cycles a little before it posts. What could be the issue here? I already tried resetting the CMOS multiple times. I let my pc run for a bit and laid my hand on the RAM sticks, they were hot.