The problem with the PS4 Pro is that the regular PS4 is practically the same. It has more power, more than double the power but it's mostly useless and I will thoroughly explain exactly why.
The PS4 Pro only offers a resolution bump over the regular PS4. It does not offer substantially better framerates and doesn't even offer higher resolution textures. Basically it's the exact same assets as the PS4 but running at 1440p or a checkerboard 4k. They both support HDR.
Now there are two main categories of customers, those with 1080p displays and those with 4k displays. I am sure everyone here will agree that anyone with a 1080p display that doesn't plan to upgrade to 4k soon, has no business buying a PS4 Pro. Well, I'm going to explain why even if you own a 4k display, you wouldn't really benefit from a PS4 Pro over a PS4.
TLDR; scroll down
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Look at the image to the left. If you have a 4k display, your display is made up of 3,840 pixels horizontally by 2,160 pixels vertically. That equals(multiply 3,840 X 2,160) = 8,294,400.00. That is over 8 million pixels.
If you have a 1080p display, your display is made up of 1,920 pixels horizontally by 1,080 pixels vertically. That equals(multiply 1,920 X 1,080) = 2,073,600. That is over 2 million pixels or roughly 1/4 the pixel count(size of canvas) of 4k.
Think of a television display as a canvas where your gaming images will be drawn. Of course a much larger canvas will show a lot more details. A 4K display is really 4X the size of a canvas as a 1080p display. You need to be clear on this to understand how scaling works.
Every 4k display automatically scales everything you feed into it to fit the 4k display. What does that mean? Look at the image below. If your 4k television didn't scale the image, then a 720 signal that is sent to it, would look like a tiny square in the middle of the screen the size of the 720p square in the image compared to the 4k. Since it would be ridiculous to have a 65" 4K for example to watch a tiny image in the middle of the screen, all 4ks automatically stretch the image to fit the full screen.
The smaller the original(native resolution) image is, the worse it will look once it's stretched all the way to fit the screen. A 1080p image is roughly 1/4 the size of a 4k canvas as you can see in the image below. This means it has to stretch less to fit the screen so it will look better than the 720p native image. Then there is 1440p which is about 3.6 million pixels so that makes it a little less than half the size of a 4k. It has to stretch a lot less than 1080p to fit 4k but it's still less than half the size.
Of course a native 4k image is 4k so the tv doesn't need to do anything, it just displays the native 4k image that fills the entire screen natively and that of course offers the best quality.
Let's now compare the PS4 vs PS4 Pro. Remember, all 4k televisions will upscale any image that is not 4k, all the way up to 4k. With a regular PS4, you can send the image to the TV at 1080p and have the TV upscale it to 4k. Or you could set the PS4 to 4k which would mean the PS4 is internally upscaling the image to 4k so the TV doesn't have to do anything. If you have a cheap tv with a bad upscaler then this would be the better option. Now the PS4 Pro since it doesn't have the power to send a native 4k signal either, it can only send an upscaled 1440p image that your tv doesn't have to do anything with.
The results will be very similar between PS4 and PS4 Pro. Especially if you have a good 4K television with a good upscaler. It may even look better than a PS4 Pro game on a cheap 4k television.
Again, this is because the PS4 Pro only offers a resolution bump that still doesn't even fill half of a 4k screen and has to be upscaled. It doesn't offer higher fps than a regular PS4. It doesn't offer better texture quality or assets over the PS4. It will never be able to offer higher quality assets because it has the same amount of RAM as the regular PS4. It's using higher resolutions so if anything, the RAM is bottlenecking it a lot more than the standard PS4.
TLDR;
If you have a really nice 4k TV such as the Sony x900e, a PS4 game will look great on it with the FALD and great HDR implementation as well as superb upscaling. If you plug in a PS4 pro you will use the PS4 Pro's internal scaler instead and may actually produce inferior image quality vs a regular PS4 which again will be using the Sony television's higher quality upscaler.
The Xbox One X doesn't suffer from these problems. That is because the X has 12 GBs of RAM so that almost doubles the amount that is reserved for games vs PS4 Pro(9GB vs 5GB). Also the X has much faster RAM which along with the extra GPU power, allows the X to display 4k assets and 4k textures in 4k games just as long as the developers patch it in of course.
I know the X doesn't always do native 4k. But when it doesn't it at least does 1800p which would be an image that almost fits the entire 4k screen(about 80%) with only minimal upscaling required by the X internally. This produces a superb image that is very well suited and looks great on 4k tvs. Even though it's not fully 4k native. The X has been lauded for having an exceptional upscaler. That is why DF routinely states that PS4 Pro games are better suited for 1080p tvs and Xbox One X games are recommended to be played on 4k displays.
The PS4 Pro is a dumb system that just doesn't make sense. Actually it does make sense as something designed specifically to improve VR which it does very well. So only buy a PS4 Pro over the PS4 if you plan buying the PS VR. Other than that, just get the regular PS4. If you want a real upgrade in visuals and you own a 4k television, you need the X.
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