Asus ROG gaming laptop Nvida GEForce GTX 960m, intel i7 core. It's a few years old, but it's still a good computer. I'd love to play on a desktop, but you know, don't really have the space for it atm. But it runs fine for me, I don't even use laptop mode. I have it sitting on a cooling fan platform to help with the heating issue. Tried playing on Mac before, and it lagged a lot on it. I have all of the packs except for the Starwars one, and the clothing kit. I do run a good amount of mods, but S4 still runs well for me.
I used to play S3 on my old Toshiba laptop, and it was not good. But who knows if it was the laptop or the game lol