So I just bought a new rig and I've tried a lot and nothing seems to work. My ram is showing up as 7.95 usable out of the 16gbs. Ive tried the msconfig and the memory test. Ive also tried updating the bios and changing the speed to 2666Mhz. ram is Corsair DDR4 2x8GB, 3000MHz. I should also mention that I tried the same sticks in friends pc whos running an intel i7700k and it worked just fine with a full 16gb. I should also say that if I start the pc with one of the ram sticks only it boots up, but if I try the other one, nothing loads up on the screen.
Here are the stats; https://imgur.com/a/qFjt3PY
Here are the stats; https://imgur.com/a/qFjt3PY