Got my parents old Pc, took it apart and decided to upgrade it a little (used my old GTX 1060 OC, an old HDD which I soon want to upgrade to a SSD, old power supply). I also decided to build a case myself (5 mm thick acrylic). I overclocked the CPU to 4ghz and the gpu a little with Afterburner. Benchmark GTA 5 on High Settings: GPU rarely hits 80 degrees under load and CPU sits between 60 and 70 degrees. Noticeable is the PSU and the GPU when it's under load.
I haven't decided on a name yet... So if you have any suggestions please comment.