can you use 3 ram slots
when using only 2 out of 4 ram slots which 2 are best?
Why Does Your Motherboard Have Four RAM Slots? ... Now that we understand why a motherboard has four RAM slots, we can determine how many RAM sticks you should use.
What RAM (Memory) Is Compatible With My Motherboard?
The more DIMM slots your motherboard has, the more RAM sticks you can install.
Pair PC3-DDR3 with PC3-DDR3L memories - YouTube
Can you use your older DDR4 RAM modules with the latest DDR5 motherboards?