1. The Fury X needs this or it can't run to it's potential; the 970 does not. I have yet to see a 970 hit it's throttling point.
2. Nice try EVGA; wanna explain how the "GTX 970 Standard" manages to hit 90C when the card starts throttling at 90C ?
3. While voltage is the primary limiter on 9xx series overclocking, the 2nd most limiting factor is VRM and VRAM cooling which the hybrid does nothing to address.
4. CLCs simply have no raison d'être. Using available "expandable" AIOs (Swiftech H240-X or Predator 360) along with a proper GP water block which also cools the VRM and VRAM, will easily cool a CPU and GFX card without a maze of tubing or any of the other deficiencies of CLCs. Why spend $100 for a hybrid when ya can get a true water block for $120 or so.
As the the alleged 970 RAM controversy, two things
a) The controversy is "Trumpesque" ... lot of hot air being blown, no truly observable impact unless you utilize settings and techniques far outside the realm of normal gameplay. Dozens of reputable web sites have tried to duplicate the alleged failings without success "unless they do something freaky". You can *create* a problem at 1080 / 1440p, but you have to work hard at it to do so.
http://www.guru3d.com/news-story/middle-earth-shadow-of-mordor-geforce-gtx-970-vram-stress-test.html
b) HBM1 has a problem in that ya can't stack enough RAM to fit on the PCB and it's limited to 4 GB. HBM2 is anticipated to correct issues at the 4GB barrier. Pascal will include HBM2 and AMD is expected to do the same. As is defined in the article below, no utility exists which can measure the amount of VRAM a game is using ... what they are measuring is what the system has allocated. Your credit card company may allocate you a $10k credit line, that doesn't mean you use it. Using a utility like GPU_z with a 4GB GB video card at 1440p may show it has 3 GB "allocated" for it's use, but that's just cause "it's available", as the test below show, switching to 2 GB as shown in the test below has no impact on performance.
http://www.extremetech.com/gaming/213069-is-4gb-of-vram-enough-amds-fury-x-faces-off-with-nvidias-gtx-980-ti-titan-x/5
http://alienbabeltech.com/main/gtx-770-4gb-vs-2gb-tested/3/
http://www.guru3d.com/articles_pages/gigabyte_geforce_gtx_960_g1_gaming_4gb_review,12.html
https://www.pugetsystems.com/labs/articles/Video-Card-Performance-2GB-vs-4GB-Memory-154/
Now some of those tests are old but the same principle applies and this argument has been going on since the 7xx series and before. The extremetech article should put the matter to bed once and for all.
Pascal will include HBM2 and AMD's next gen is expected to do the same.