HypetheType

Fixed it. Moving around the sticks didn't work. I unscrewed the pump of my water cooling and took the CPU out, then put it back in, put the pump back on and now everything works just as before. Maybe the CPU wasn't properly seated or there was to much/not enough mounting pressure. Anyways, it works now, thanks for your reply.

Hello, as already written in the heading above, half of my RAM doesn't pass the CPU Memory Test. I've had this issue for a while now, it usually occurred when I opened up moved my PC, for example, when I went to my friend's place with it. Usually, I got this issue fixed by simply taking the RAM out and afterward plugging it back in. Also, it is important to note that this issue only applies to Memory Channels A1+A2, not B1+B2. The problem which I am facing now is that re-plugging the RAM in Memory Channel A doesn't fix it anymore. Weirdly, however, CPU-Z still does still detect all RAM, but my system only uses 8GB of RAM. I already ran a MemTest86 too and it stated that all of my RAM was working fine. One thing which is also worth noting is that I already reset my BIOS which did not help. Back then when it once also didn't work it weirdly worked just randomly after some time again. My specs: -Intel Core i5 4670k 4.0Ghz -Asrock H87 Pro4 -16 GB RAM DDR3 1600Mhz (4x4 GB of RAM) -GTX 1070 I hope you guys can help me because I am clueless... Thanks in advance (hopefully someone answers)