CoolerMaster Cosmos II and Corsair H115i Pro installation and tips.

Searching for the better way to install this liquid cooling system, Corsair H115i Pro,  in my Cosmos II case, I found the most efficient and quiet way. At first sight, there should be no obstacles with this since this case has an option to install 140 mm fans on top of this.  Since  H115i Pro is closed loop system, so the only way is to install the radiator beneath the top side of the case and put fans outside on top.










First of all, I suggest to cut out holes on the top side for better airflow of 140 mm fans, By the way, Cooler Master in their Neptune case they made a grill instead of fan holes - so you can use 140 mm full power!

So I cut out to extend the fan holes for larger fans.
This makes fans work more efficient and as a result lower fans speed. I kept screw holes for 120 mm fans in case if I someday will change cooling system.
   You could not install fans on radiator inside since additional power connectors on most motherboards ( at least on Asus boards) will interfere with fans edge.
  Another small problem - there are 2 screws with nuts (they used to screw the handles to the top side) prevent the edge of the radiator laying flat.  It's not a big deal and you can leave it as is, but if you are as picky as me then you will have to cut off this protrusion. Those nuts are fused into top cover so even if you remove screws you will have to cut off this nuts (I used a grinder to remove them)

  The idea was to minimize the number of fans, for the most silent operation, without losing the efficiency of cooling. So I have one 140 mm (Noctua) cooler for the intake on the front panel,  one 140 mm (also Noctua) for the outtake on the backside. And these both fans from H115i to outtake on top.

   Why I set top side coolers outtake instead of intake as it would seem more logical and more efficient?

If you try intake mode, (first scheme) you will notice that internal components such as M.2 SSD, graphics card and even power supply in the bottom start heating seriously. Becuase hot air will not be able to leave the volume through the top part. It will be blocked with a stream of intake air passed through a hot radiator.
When heavy intake air pushed inside, it creates an area of high pressure in the top part of the case, divided by graphics card on two areas - top and bottom. As a result, heating from power supply,  video card could not go out through the top and start accumulating in the bottom part of case.




When we set top fans to outtake, it will create a powerful air stream that intakes from a lower part of the side panel and from front fan and then flows to the top taking heat from all parts inside and in addition, make the front fan more efficiently take heat from hard disks.





As a conclusion, I must say that this scheme works just great even during hot summer days when the temperature in my room rises up to 30° C. System is silent enough - only hard disk can be heard at night in complete silence. I successfully overclocked my7820x to 47 GHz on each core and got 90° C  at full load for about half an hour and also I can turn off fans  (Zero RPM mode) and got a completely silent system.
   Hope you will find this post usefull useful!