In order for you to play The Tartarus Key on Windows with minimal graphics settings, your computer must meet the following requirements
OS *:
Windows 7
Processor (CPU):
Intel Core i3-3240 (2 * 3400), or AMD A8-3850 (4 * 2900), or equivalent
Memory (RAM):
4 GB RAM
Graphics Card:
GeForce GT 640 (2048 VRAM) or Radeon R7 250 (2048 VRAM)
Storage:
1 GB available space
In order to play The Tartarus Key on Windows with maximum graphics settings, you need a computer with a configuration no worse than the following
Operating System:
Windows 10
Processor (CPU):
Intel Core i7-950 (4 * 3000), or AMD FX-4300 (4 * 3800), or equivalent
Memory (RAM):
8 GB RAM
Graphics Card:
GeForce GTX 745 (4096 VRAM) or Radeon HD 7770 (1024 VRAM)
Storage:
1 GB available space