Leak Shows PlayStation 4 Neo Is Expected To Have Twice The Graphics Horsepower (hothardware.com)

MojoKid writes from a report via HotHardware: Following rumors of a more powerful console in Sony's not-too-distant future -- one that will be capable of playing games at a 4K resolution -- the Japanese electronics maker last month opted to confirm it is indeed in development. Called PlayStation 4 Neo, the upgraded system will bring better hardware to the console scene to meet the needs of gaming on a television with four times as many pixels as a Full HD 1080p display. What's it going to take to game at 4K in the living room? A leaked internal document outlines some very interesting specs of the new model PS4 console. Assuming the leaked document is up to date with Sony's current plans, the PS4 Neo will use the same Jaguar cores as the original PS4, but clocked 500MHz faster, with 8 cores at 2.1GHz (up from 1.6GHz). The more significant upgrade will be the GPU. According to the slide, the PS4 Neo will use an improved version of AMD's GCN compute units (CUs), with twice the number of CUs at 36 instead of 18. They'll also be clocked faster -- 911MHz versus 800MHz. The net result is a 2.3x improvement in floating point performance.

Comments

Re:I don't think that's enough

[Kjella]

No, you certainly are not a graphics expert. I am not either, but at least I know that scenes are not composed and rendered for each pixel. So, when you go from 1080p to 720p which has 2.25 times less pixels, you never get 2.25 times more frame rate.

Probably because there's some kind of setup time/synchronization between different types of rendering passes. But if you think of a 3840x2160 image as four 1920x1080 quadrants you'd think each step would take roughly 4x to do with the same level of detail. Just grabbing a few benchmarks from Anandtech, Dirt Rally (DX11):

1920*1080*132 = 274 million pixels/s
2560*1440*91 = 335 million pixels/s
3840*2160*49 = 406 million pixels/s

Clearly there's some scaling here, if it can render four quadrants at 49 fps ideally it should be able to render one at 49*4 = 196 fps. So if we take 132/196 = 2/3 as a rough number for the scaling benefit it should probably take around 4*2/3 = 2.7 times the horsepower to go from 1080p60 to 2160p60. Same setup/synchronization overhead, 4x runtime on each part, I'm sure you could try doing a linear regression and use Amdahl's law to see if this makes sense. Now I'm making a ton of assumptions here, but from my napkin calculations it doesn't look all that bad.