WTH is with 792p and 900p. I know most games run at 1080p on PS4 and I don't remember seeing anything different. How do you achieve a 792p resolution and why?

Apparently is odd resolutions themselves are related to aspect ratios. If the game doesn't run properly at 1920 by 1080, you can reduce the amount of pixels the GPU has to generate substantially by reducing the resolution. However, the reason you see strange resolutions like 792,900,912, is actually more related to the vertical resolution because the goal is to maintain an acceptable aspect ratio. (16:9)

Internally, the game is rendered at 792p/900p "natively". Then the XB1's scalers upscales the image to 1080p and outputs that to your display/TV. Upscaling take makes duplicates of pixels and places then next to pixels to make the image bigger eg. 900p to 1080p. This slightly blurs the image a bit. The more upscaling you need to do the blurrier the image will be. The XB1 scalers also adds or increases contrast of the output image, this reduces the blurred/softer look of the image due to the upscaling (and some will say makes its picture look more vibrant) but a downside to this is crushed blacks on the image.

Why? Every image you see on your screen is made up of pixels. Every pixel has a memory footprint and render time. The less pixels you have to render on screen, the faster you can output your pixels (framerate) and the less memory the image takes up.

Devs/MS don't want games at 720p so they do everything possible to go past that. Thus we have all these weird resolutions.

So basically If Xbox One or PS4 couldn't handle 1080p, they would go for 720p and add off of that to see how far they can push. Got it?

Rebellion Games’ Jean-Baptiste Bolcato, who is working as a Senior Producer on the upcoming Sniper Elite 3, had some interesting opinions about that though. GamingBolt spoke to him about Sniper Elite 3’s Xbox One development and asked how the team was handling eSRAM. Some developers use it for texture streaming, storing z-buffer and praise its ease of use while others have problems – how is Rebellion handling that?

Bolcato stated that, “It was clearly a bit more complicated to extract the maximum power from the Xbox One when you’re trying to do that. I think eSRAM is easy to use. The only problem is…Part of the problem is that it’s just a little bit too small to output 1080p within that size. It’s such a small size within there that we can’t do everything in 1080p with that little buffer of super-fast RAM.

“It means you have to do it in chunks or using tricks, tiling it and so on. It’s a bit like the reverse of the PS3. PS3 was harder to program for than the Xbox 360. Now it seems like everything has reversed but it doesn’t mean it’s far less powerful – it’s just a pain in the ass to start with. We are on fine ground now but the first few months were hell.”

Read more at http://gamingbolt.com/xbox-ones-esram-too-small-to-output-games-at-1080p-but-will-catch-up-to-ps4-rebellion-games#AKwPW3HW7ox1MpAr.99

900p is 1600x900 pixels.  It is roughly half the resolution of 1080p.  When someone says "p" they mean that number multiplied by another number that is 16/9 times bigger.  16:9 is the aspect ratio.

It's not far less powerful, just notably less powerful.

I do wish this gun's minimum performance was 1080p at a solid 30fps. But it seems like even PS4 might struggle there, at least in terms of maintaining a constant frame rate.

If the game is uupscaling to 1080p then pushing out the max number of pixels makes for a better displayed image I would think. If it's not upscaling then you don't want "last gen resolution" thrown in your face, even though over all the game's visuals would be superior to last gen.

it's better than 720...............and the game is too much to handle 1080...

more of a rare thing but the ps4 is also forced to bend at times.

That's very rough. Isn't the disaprity closer to 30%?