Yeah, stock. I would be too nervous to overclock it or anything like that. Though maybe it has some dynamic form of it? I wouldn't know, but I highly doubt I've pushed it much. It's interesting to hear that CPU was really nice for its time; I didn't even realize what I was picking back then. I guess that's how everything's survived this long, haha, since January 2011. I just kept procrastinating on getting anything new besides the graphics card and RAM.

Oh, speaking of, this is the RAM, along with other things, just to have it all together:
CPU: Intel Core i7-920, 2.66 GHz
GPU: Nvidia GeForce GTX 970, 4 GB
RAM: 12 GB Triple Channel DDR3, PC3-10700 667 MHz (9-9-9-24)

Anyway, sounds like you were onto something, but not, huh...technically, it could be anything.