Hell is an experiment you can't survive in Outlast, a first-person survival horror game developed by veterans of some of the biggest game franchises in history. As investigative journalist Miles Upshur, explore Mount Massive Asylum and try to survive long enough to discover its terrible secret... if you dare.

Minimum system requirements: 

Processor: 2.2 GHz Dual Core CPU
Memory: 4 GB RAM
Graphics: GeForce GT 750M / 9800GTX / Radeon HD 3xxx. OpenGL 3.2+
Hard Drive: 5 GB available space

External links:
Developer: Red Barrels


Asylum from Hell

One of the most horrifying games I've ever played (beside of Amnesia, SOMA, Silent Hill 2/3 etc.). It runs perfect on my machine (A10-7850K, R9 285 2GiB with Mesa 12.0.3/4.8, 128GiB SSD for root, 16GiB of RAM).