PS4 + XB1 Pixels Per Second ?

Dicehunter · 6 Dec 2014 at 00:34

Anyone know the stats on how many pixels per second the consoles can push out please ?

Raymond Lin · 6 Dec 2014 at 00:37

1080p, frames per second (24? 30? 60?) = ???

spoffle · 6 Dec 2014 at 00:39

Can and do are very different. It depends on the game.

Dicehunter · 6 Dec 2014 at 00:49

1080P 60 fps, No clue how pixel calculations work XD

spoffle · 6 Dec 2014 at 00:53

It's really simple maths.

1920x1080 = 2,073,600 pixels. That's 1 frame.

If it's at 60FPS then it's the above, 60 times a second.

Dicehunter · 6 Dec 2014 at 00:54

spoffle said:
It's really simple maths.

1920x1080 = 2,073,600 pixels. That's 1 frame.

If it's at 60FPS then it's the above, 60 times a second.

You know those moments when you go "Oh yeahhhh" I just had one

Zhokel · 6 Dec 2014 at 09:14

spoffle said:
It's really simple maths.

1920x1080 = 2,073,600 pixels. That's 1 frame.

If it's at 60FPS then it's the above, 60 times a second.

I see where you're coming from but it's not that easy.

You're going to have multiple render targets to draw to (especially with deferred rendering), so that could be an extra 4 or 5 1920x1080 textures to render to on top of your final buffer (depends on the engine on the amount but that's most likely the figure on average).
Then there is the case where something is partially obscured. So say you draw a wall, then draw something that's partly in front of the wall, you've already drawn the pixels of the wall that's now no longer relevant and the depth buffer is going to discard those pixels. It all adds up

If something is completely obscured, then if the engine is up to scratch it will just outright not even attempt to render it. Oh and AA adds even more load.

Then depending on other rendering techniques you will probably have other textures to render to. Some shadow techniques require you to render the scene from the light sources perspective for example.

Basically though, it all adds up eventually! I mean obviously you're only going to ever see at most whatever the frame rate * the resolution is as you said

, but they do push out a hell of a lot more pixels than that

As for how much they can do, it's estimated that the PS4 can do 25,600,000,000 pixels a second and X1 is 12,800,000,000 pixels a second. Who knows how right they are as it's calculated from the stats we do know, but it's never reliable tbh, just rough estimates. Also I think the X1 might have a bit more now as they increased the GPU clock slightly? So that should put it around ~13 gigapixels/s.

edit: for anyone wondering on the math for fill rate,

GPU clock speed * render output pipelines

PS4 has 32 ROPS while X1 has 16, which is why there's a bit of a gap.

spoffle · 6 Dec 2014 at 12:13

I don't think the OP had such a complex question in mind.

I was talking strictly pixels output to the display rather than what's being rendered.