PS3? Pretty much any integrated graphics card with a powerful Intel i7 CPU. Weird setup, but that’s the closest you can get to Cell’s ridiculously overpowered, ridiculously paralleled CPU architecture. Most integrated graphics cards will exceed the 4.4 Gp/s fillrate for pixel shading, and you will not find a computer nowadays that offers less than 256 MB of RAM. I think some of the higher-end integrated graphics cards are better than Xbox One quality. 25.6 Gp/s fillrate is what you need to surpass the PS4’s pixel shading performance. A GTX 560 ti will easily outdo it, and most likely the GTX 950 as well. 8GB of RAM is not hard to find. The PS4’s CPU however is a lot different than the Cell: a very slow 1.6 Ghz i7 (don’t think that exists) with boost capabilities comes close to replicating it.
Be careful when you say “this game runs 1080p 60 FPS on the PS3, it should run like that in UE4,” because UE4 uses an entirely different lighting system that’s a lot more difficult to process. It’s based on reflections instead of a basic direction to a colored light source. If you don’t have the power to provide reflections for the map, you won’t be able to light it as quickly. So, just a good comparison to make, Super Smash Bros. 4 runs on the Wii U in 1080p 60 FPS but with outdated phong shading, and Mario Kart 8 runs 720p 60 FPS with UE4-like physically based rendering, and absolutely no screen space reflections (I think MK8’s kart/character reflections are pulled from a scene capture that updates once every 65 frames, while the environment uses a generic one-size-fits-all ambient reflection). Both of those games run without anti aliasing, or any of UE4’s advanced post processing effects.
UE3’s Phong shading:
UE4’s physically based rendering: