I have 32 gb of ram but only 15.9 is usable the rest is hardware reserved. It says on task manage and resource monitor. I have 4 sticks, if I take out 2 sticks I only get 8 gb its like my memory is cut in half. I have asrock b450 pro4 with r5 2600 and rtx 2060 super and my ram is Corsair vengeance lpx 16 gb ddr4 3000mhz but I have 2 sets of it to equal 32gb