installed, 8GB RAM and a 256GB Samsung EVO Pro SSD that I had in storage.Tested with Windows 10 Pro & Linux Mint (An Ubuntu fork) and both OS's worked flawlessly, surprisingly (or not) Windows 10 ran less CPU cycles and cooler than its rival, probably due to kernel or other factors that may have one OS out of the box ready for this item.  However I still run linux off it, because I choose to.If you want a "Raspberry Pi" type size but you want more power to do more, this is a great little wonder.