The CLC type coolers already come with high speed / higher SP fans because they need to make up for the poor heat transfer coefficient of all CLC designs ...
-Weak pump (typically around 0.1 gpm
-Aluminum radiator
If you want to improve on that, you will need to create even more noise with higher rpm fans ... for what gain ? It is not going to bring anything to the table.
Might I suggest another alternative ?
Here (23:10) we see the X61 beating the Noctua NH-D15 air cooler by just 1C but to do that it needs to be more than 4 times as loud. The Swiftech H240-X (w/ 1.0+ gpm pump and all copper rads) beats the X61 by 5C while being half as loud as the X61. The X61 has since been replaced by the X62 and the Shiftech h220-X by the H22 X2 and the H240-X by the H240 X2
https://www.youtube.com/watch?v=PYKdKVxbnp8
Push / pull on a radiator can increase delta T from 10 - 30% ... on the Kraken, I'd expect closer to the 10%. With the Kraken (weak pump / aluminum rad / no reservoir / not expandable) costing $10 more than the H220 X2 (strong pump / copper rad / reservoir ./ expandable to add GFX cards or whatever) I really can't see a case for the Kraken X62. The Swifteck also kicks tail in both the noise and temps department.... it' has better aesthetics and each compenent is available separately ... if pump dies, you replace the pump ... no similar option w/ Kraeken or any other CLC.
If you have room for the G320 x2 .. that's 3 x 120mm of fans and is enough to also cool your GFX card also. Adding a GFX card such as the MSI Seahawk 1070, requires you purchase some extra tubing and two G-1/4 fittings for a complete system ... go SLI later with a 2nd rad and your AIO still has all the oomph to cool them
http://www.swiftech.com/aio.aspx
As for fans ... Hi SP fans is a thing left over from "the ole days" when 30 fpi rads were common. copper radiators today are typically 8 - 12 fpi and have no real need for hi SP fans. The cheaper aluminum radiators found in CLCs will sometimes increase fpi in an attempt to compensate for the lower heat transfer capability of the aluminum material. As you saw in the above test .. it does have an impact, but not quite enough to catch up to copper.
What case are you using ? The Luxe tempered is an astounding water cooling case which allows you to put the fans in the "attic"
It becomes with the very best fans on the market and no, case cooling does not require hi SP fans ... they would be a detriment actually as you would lose low end speed control.
Front: 2 x 120mm (3 x w/o ODD cage) / 140mm fan (2 x 140mm fan included)
Top: 3 x 120mm / 2 x 140mm fan (1 x 140mm fan included)
Rear: 1 x 120mm / 140mm fan (1 x 140mm fan included)
Take the fan out of the top and install it on the case bottom as intake.... nothing left to buy
Also, remember ... radiator fans always get installed as intakes ....no exceptions.
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