PC Antek i7700k, 32GB DDR4, Up to 6 HDD/SSD Plug&Play Storage capability.
Fast PC with easy Storage add or removal option (Hot Plug) = you can start or stop your drives without turning off the PC, just pressing a button on/off (for before pressing the button you should remove it from the system with Safely Remove Hardware and Eject Media from Taskbar).
Note: If you are interested you have to take in consideration to change the cooler for the processor because it is the factory model and you can hear it and if you are thinking to put a better graphic card you should consider changing also the power source (this one is only 380W).
If you want to use 3.5 inch HDD it will fit on the limit, but you can close the side anyway. It is just tight. I have used it so without problems with 3x 3.5 inch HDD.

Operating System: Windows 10 Pro.

The PC works very good, it is very fast. It was not used for gaming, just for occasional backups.
Reason of selling: a smaller PC for office work.