There are 3 main reasons for water, temps obviously, looks and noise.

I personally don't like AIOs at all. They're inconsistent, could either be noisy, look terrible, or just like I said... prematurely fail without you knowing.
That's why I said if AIO is the last resort for lower temps, that I do not agree at all. A very well optimized case for airflow and airblow is just as good as AIOs, if not better (the latter, if you bring cost into the discussion).
Keep those fingers crossed. I'm not trying to hate on AIOs, but when I open up and see how low quality the stuff are in there, it cringes me when people go around and say AIOs are awesome. They didn't even know what they paid for. AIO isn't even leak-proof to begin with, yet it is being marketed as being so...?

Good that your AIO has not died. But just keep an eye on it when you start hearing the pump squeel. Have seen several systems died because of a failed AIO and the system was left running at very high temps for a long period of time.

ooo so the 20fps increase isn't really the full story ? ok i'll check that out ty.
*update

found a newer video

well amd's fiji was using hbm1 which had a critical flaw. it was maxed at 4gb vram compared to current offerings like 980ti that had 6gb of gddr5 vram.

that said it was few titles that pushed vram usage, and even then most of the time it was for 1440p or higher resolutions.

but still it was a limitation.

hbm2 which is what pascal will be using will be either 8,16 or even 32gb. Either one will still be amazingly ample enough for just about anyone 

also bandwidth will be 1tb vs the current 500 ish or so for hbm1.

So in my book i think that is more than mature worth me buying :} so i wonder, what improvement to it do you think is worth waiting for that on book seems more than sufficient to last for a long while    more vram ? seems like even 8gb is good enuff. faster bandwidth speed ? Sure but by how much and is it really worth waiting on that ?
people also mentioned how 980 quickly is going to become obsolete by a large margin due to many factors pointed out about pascal's tech e.g.
1. hbm2 (smaller gpu cards, more memory bandwidth and bigger vram capacities)
2. nvlink (probably going to benefit multi gpu setups)
3. double the transistor count of a titan x and fiji amd (better gpu performance ?)
4. mixed precision (probably less of an affect for gamers)

basically i think this is going to be one of those times there is a giant leap in performance. volta was delayed for quite a long time and is scheduled for after pascal maybe 1 or 2 years after. i'm placing my bet the leap from pascal to volta won't be too huge.