Hi guys, as above said, of course you need a SSD. I got a stutter every 3 seconds when the DCS 1.5X was installed on the HDD. After I moved it to a SATA3 SSD, wow, smooth like a silk. And the 2.5 OB works well too. DCS unlike any other games, which can load a scene's data one time. DCS has a very high view distance and you are driving a fast moving objects, so it needs constantly loading big texture data. SSD is faster and stable.