Fallout 4: This game is essentially a polished turd. While still a great game, it seems to utilize much of the same underpinnings of Fallout 3 and New Vegas. Because of this older engine, the game runs very smoothly on older hardware with very high framerates, even maxed out.

Doom (2016): I am incredibly impressed by games running on this engine. The new Wolfenstein games ran superbly well with just one 560Ti, while looking better than nearly everything out there. This new Doom, with everything on Ultra settings, returns 90+ FPS in firefights with a lot of stuff going on. I was not expecting it to run this well, but I am not complaining. Bethesda/iD/Whoever have built a great engine. This may come down to the fact that this game is OpenGL, and all of the textures are there. The download for the game was roughly 70GB. There is no lag running it off of my storage drive, a WD Blue 2TB hooked up via SATA II.