Playing games at 1440p on 4K monitor?

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Hello, I'm upgrading to a 1440p/4K setup soon, and I'm stuck between two monitors. One is 1440p, and one is 4K. I'm not sure if G-Sync is worth it, but it gets good reviews and positive feedback, so I figured I'd save up for one of the two monitors. G-Sync seems to be a very expensive feature...

Both monitors are 144Hz, and both have G-Sync.

Here is the 1440p monitor:
http://www.ebay.co.uk/itm/281724647871?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Here is the 4K monitor:
http://www.ebay.co.uk/itm/371307199269?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

My question or concern is actually about weather gaming at 1440p on a 4K monitor will still look just as sharp, crisp, and as native graphically as gaming at 1440p on a 1440p native monitor. Will it have to downscale from it's native 4K to 1440p while playing games at 1440p?

If buying a 4K monitor displays 1440p just as perfect as a native 1440p monitor, I might as well buy the 4K monitor, as I plan to eventually SLI two GTX 980 Ti's in my rig to reach smooth 4K display one day in the future.

One GTX 980 Ti should render 1440p as smooth as butter. Two should handle 4K relatively well, right, or would a Titan X be a better choice?

I'm also stuck on the fact that I've seen a few times around the forum, that 1440p and 4K resolution on a 28" monitor isn't really going to change much, there will be barely any noticeable differences, due to the fact the monitor size is already small enough to compact the pixels. Is this true?

I thought the pixels on a 28" panel would still be the exact same as a 40"?
Just because the monitor is smaller, that doesn't make 1440p and 4K any different, does it? The pixel size doesn't change, only the size of the panel(?) They should still both be huge differences from 1440p and 4K, right?

Which one should I pick?

Thanks for putting up with all these walls of text!
 
Solution
1440 on a 2160 display is going to blur the image and fine detail will be lost. Youre losing 1:1 pixel mapping. As for pixel density. The higher you go the smaller objects on the screen. A lot of people are inredibly misinformed and continue to spread wrong or bad information. If you see yourself sitting no more than 1-2 feet away from the screen, 4k is for you. Lastly, the difference between a 28" and a 40" is not big. Higher res only make sense in a cinema environment. Save your money and buy a quality 1080 panel. If you have the computer power for a 1440 panel, get that instead. Windows don't work well with 2160. Not sure where those who say that, get it from. ~All the best!
1440 on a 2160 display is going to blur the image and fine detail will be lost. Youre losing 1:1 pixel mapping. As for pixel density. The higher you go the smaller objects on the screen. A lot of people are inredibly misinformed and continue to spread wrong or bad information. If you see yourself sitting no more than 1-2 feet away from the screen, 4k is for you. Lastly, the difference between a 28" and a 40" is not big. Higher res only make sense in a cinema environment. Save your money and buy a quality 1080 panel. If you have the computer power for a 1440 panel, get that instead. Windows don't work well with 2160. Not sure where those who say that, get it from. ~All the best!
 
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CPUzX

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Just what I needed to know. Thanks!
I've decided to go for the Acer XG270HU, but I might go for the G-Sync one: XB270HU!