Intake/Exhaust Questions for H100i

Fissh

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Jan 29, 2015
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Hello Everyone,
I am modding a HAF912 to fit a H100i water cooler to the top/outside. The general advice is to have intake to the cooler from outside air. This presents a bit of a question/problem for me.
I currently have 2x 120mm intake front, 1x 140mm intake side, x1 200m exhaust top, x1 120mm exhaust rear.
With the H100i rad on outside top of case, and if I do intake to it (negating the 200m exhaust top), I am left with only one exhaust (x1 120mm exhaust rear). Obviously, that will make a positive pressure of huge amounts.
Should I just do exhaust on the rad? With my rad on top, my high pressure statics will be in case (exhaust from case but intake to rad), leaving that gap where the metal of case is between rad and fans (will this cause a major decrease on my high pressure statics?). I do plan to PP the rad, so there will be fans outside case as well. That will still leave me with exhaust rear and top, but is that sufficient for the rad? I will be in-taking potential warm air from case to rad.
Alternatively, I considered doing the top intake into rad from outside (making the top an intake) and switching the side to exhaust (x1 140mm side panel). But that is where I get a direct intake on my GPU. I feel like I am dam*ed if I do and dam*ed if I don't. Any suggestions?
Also, I would love to add fans inside, specifically pointing to my GPUs. I removed the HDD middle casing inside to make room for my GPUs (x2 R9 280x) and relocated the SSD and HDD to bottom casing. This leaves an open area, where I would love a fan, any ideas how to install one there? Also under the dvdrom I could fit another intake (no brackets) to make for x3 intake fronts. This particular location could accomodate zip ties.....can zip ties snug up a fan enough to make it quiet/efficient and/or even worth it? Or is there another method that I can get a fan there for intake?
Or is that overkill and not worth the time/effort?

HAF912
ASUS Crosshair V Formula-Z Mobo
AMD FX-9590 Vishera 8-Core 4.7GHz
H100i Corsair Dual 120MM Liquid Cooler
Corsair Vengeance 16GB DDR3
x2 in Crossfire: Sapphire Vapor-X Radeon R9 280X 3GB
1000W Power Supply
SSD Crucial M500 480GB SATA 6Gb/s 2.5"
Western Digital 1TB HDD

http://us.coolermaster.com/product/Detail/case/mid-tower/haf-912.html
* with middle drive casing removed

I am planning to OC and want to first make sure I have the cooling as optimal as possible. This is my first MOD, but I have confidence in my rotary work, just not the efficiency of my solutions. The case is old but at the least used to be popular, so hoping some people have insight. Any advice and direction on this would be GREATLY appreciated.
 

Fissh

Reputable
Jan 29, 2015
5
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4,510


thx! I secretly want it in the front, but not willing to put forth that much mod time/effort at this time :p

 

slyu9213

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Nov 30, 2012
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11,660
Only time intaking makes sense for water cooling is when the radiator is located in the front or side to bring air in. While at the top I would always use it as exhausts in my opinion.

I use to have my H100i as an intake in a small Micro-ATX case (N200) but in my 600T and bigger cases the radiator can't reach the front. Only choice is to exhaust really. Depending on your ambient temps/inside case temps your radiator would be using warm air to cool. Warm air rises, and I wouldn't really want the H100i to bring back the warm air that was rising back into the case.