re: nVidia GTX Titan - SM8 Titan SLi [Build Log], coming..

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Isn't 4k resolution coming up pretty quick?

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I'm not so sure. They are making 4k displays but they're pretty rare and very expensive. I also don't think it will be coming to gaming for a while. If 1440 is a third more pixels than 1080 then 4k is 4 times as many as 1080 roughly. If 4k is coming relatively soon, it isn't coming to 24-27 inch monitors very soon. 4k is mainly going to be coming to larger screens 45 inches and above because at that size 4k resolution will make a noticeable difference over 1080p. 4k is also going to be the next marketing gimmick for TV manufacturers to crank prices back up.

Mobile devices currently benefit from pixel densities over 200ppi because they are viewed from 3-5 inches where pixels are discernible. Most people view their monitor at 2 feet. In order to reach the density of "retina" displays you would need 8k on a 25-27 inch monitor. Could PC gaming use an increase in pixel density from 95ppi(25 inch screen at 1080)? Hell yes, that's what 1440 and 1600 displays are for, but nobody needs 4k for a computer monitor especially at stupid high prices. There's not enough availability of name brand 1440 monitors as it is now. Not to mention I don't think any current display out would support 4k and 120Hz refresh rate which is particularly important to some gamers.

Long story short, look how long it is taking for the standard to change from 1080 to 1440. Now think about the logistics of developing, pricing, producing, and actually SELLING 4k displays in the typical monitor sizes. Not going to happen any time soon IMO.