I upgraded from a Ryzen 5 3600 to the new 5600X today. I was running 4x8GB DDR4 RAM. With the 3600 and it worked fine, dual channel/32GB and all. With 5600X it only allows me to put RAM in the first two slots (A1/A2). I did test all four sticks in (A1/A2) and they work perfectly. No matter what...