i had 8 gb ram but my windows 7 64 bit said only 4gb something was usable so when i upgraded to windows 10 i also upgraded to 16gb ram and its doing the same thing saying 7gb something usable and 8.1gb in hardware reserved so i downloaded cpu z and it says in the channel mode its running single mode not duel is there any way to change to to duel or is it a faulty motherboard also i tried moving my ram into different dimm slots still the same.