TheWizardMan
If you're gaming in 4K it's absolutely not overkill. Although, it depends on whether the games you play support, and are optimized for, SLI. 
 
With the impending release of 4K 144HZ monitors (albeit, for the ridiculous price of $2000), you'll even be able to use 1080ti in SLI to its full potential.

jcbullen
Some day we'll have high enough resolution that increasing it further wouldn't net any visual gains and our GPUs will be able to keep up a little better.  What happens then??

Sajin

jcbullen
Some day we'll have high enough resolution that increasing it further wouldn't net any visual gains and our GPUs will be able to keep up a little better.  What happens then??

I could see gpu prices skyrocketing due to people not having to upgrade as often.

TRClark911
I value resolution over refresh rate which is why I went 4k 60hz instead of 1440p 144hz...  Now if I could get both I'd probably go for it... but not for $2k.

rla1999
 
If you want to play in 4K at high FPS, having two is a must, in my opinion.

rla1999
Since there is at least one 144 hrtz 4k monitor out, I also consider that.

Sajin

rla1999
Since there is at least one 144 hrtz 4k monitor out, I also consider that.

Which one is that?

Category 5
ROTR was running at a solid 60fps in 4K on my two 1080s, but the single 1080Ti gets about 38-45.  It's gets choppy and isn't even close to the same experience.  I won't even try to play the Ghost recon game with one GPU.  It's a stuttery mess unless I drop it to 1080p or dump a ton of visual effects.  I know not everyone has to play with ultra settings pegged, on a 4K screen, but that was my goal in building my PC and even this beastly 1080 Ti does't do it alone.
 
I did play a couple of games at 1080p just to see how the GPU did and it literally downclocks to like 700MHz with like 1200Mhz memory.  I was playing stuff with visuals pegged, and my air cooled founders edition was sitting at like 40C.  Hilarious, but eye opening when considering the compute penalty 4K brings with it.
 
I realize that if the 1080 Ti is an 11 TFLOP card it's gonna take 30-40 TFLOPs to do decent 4K VR, and probably in the 100s before we get 8K VR.  And it's gonna take 8K to get realistic resolution for the whole FOV.  I guess that's gonna take a decade.
 
FWIW, I was blown away by my 980Ti a year and a half ago, after having not tried a modern GPU since the Radeon 6970, so I'm not complaining.  I just see that in spit of all this power, there is still plenty of room for more.

HeavyHemi
Yes...I consider the 1080 Ti the first 'entry level' 4K GPU. Like you, I want to be able to use the highest graphical settings and maintain a min of 60 FPS. You cannot do that with several AAA titles.

evga-lover

TRClark911
I value resolution over refresh rate which is why I went 4k 60hz instead of 1440p 144hz...  Now if I could get both I'd probably go for it... but not for $2k.

For me the sweet resolution is 3440x1440 at 34in. Gaming in Ultra-wide 21:9 aspect ratio is amazing!
 

HeavyHemi
Lose sleep? No, but my preferred min is 60 FPS, below that is choppy. But sure I don't think anyone  is arguing it's not the best option under  $1200 I've played BF1 and you cannot max it out (disregarding resolution scaling) and keep it over 50 FPS on certain spots. Reducing a couple settings that are not really visible to the eye, and you can. Fallout 4 still drops into the 50's.  But again, reducing shadow distance, resolves that. So, for the most part with a few compromises you can run at 4K.  At this point it is more or less personal preference and, 'compromising'...well I've always been somewhat a of graphics whoooooooer.