Optimal fan arrangement for Case cooling

RJ12

Honorable
Aug 8, 2013
2
0
10,510
Hi, I plan on building my first pc (or rather, modifying an old pc I had built) and quite frankly all the information out there seems very confusing and in many cases contradictory.

One area of confusion for me is fan arrangement, I have a corsair H80i which I plan to mount on the upper rear of the case but the instructions say its best as an intake (I was under the impression that section was designated as an exhaust).

Basically, which arrangement would be best:


One in-take, two exhausts

A.) 120mm intake at lower front of case, H80i' fan mounted in upper rear blowing outwards, 80mm blow hole (blowing outwards).



two intakes, one exhaust


B.) 120mm intake at lower front, H80i' fan as intake, 120mm blow-hole (top of case) as exhaust.



Suggestions for better arrangements are more than welcome.


The PC i'm modifying has always had some real overheating problems, so it's something I really want to get right when I fit everything, it's specs are:

i7 920

Asus P6T Deluxe motherboard

Antec 750W PSU

Palit HD4870X2

In all honesty I don't think the people who assembled it did a very good job, wires and cables all over the place, one fan on the back and the heat-sinks fan misaligned with the ports on the side.

It's always been a bit temperamental and in recent time it's seemingly eaten through two HDD very quickly (an error on boot up saying 'No hard disk detected!' and many a temperature message). I realise I should probably start from scratch with completely new components, but i'd like to at-least salvage the processor and if possible the Motherboard (But I suspect it may be part of the problem) as 1366 Motherboards are still quite expensive.


Thanks for any help.
 
Solution
Hi, I plan on building my first pc (or rather, modifying an old pc I had built) and quite frankly all the information out there seems very confusing and in many cases contradictory.

Yes, the fan cofig, especially concerning liquid radiators, can be all over the place.

Generally, from bottom intake, top/back exhaust.

But introducing the radiator brings a new consideration. If the rad fans are blowing out (exhaust), they are blowing already hot air from inside the case across the rad fins.
Blowing in (intake), and you are blowing cooler outside air across the rad.

The Corsair QuickStart recommends having it as intake.

Try it both ways. Keep a log of the temps.

USAFRet

Titan
Moderator
Hi, I plan on building my first pc (or rather, modifying an old pc I had built) and quite frankly all the information out there seems very confusing and in many cases contradictory.

Yes, the fan cofig, especially concerning liquid radiators, can be all over the place.

Generally, from bottom intake, top/back exhaust.

But introducing the radiator brings a new consideration. If the rad fans are blowing out (exhaust), they are blowing already hot air from inside the case across the rad fins.
Blowing in (intake), and you are blowing cooler outside air across the rad.

The Corsair QuickStart recommends having it as intake.

Try it both ways. Keep a log of the temps.
 
Solution

RJ12

Honorable
Aug 8, 2013
2
0
10,510
Yeh, suppose i'll experiment with the two and see which one is the most efficient.

Are side fans any good? my case has grates on the side that look like they'd be able to accommodate smaller fans (i'm assuming 60-80mm) but i've read this can actually negatively impact the airflow? (cools one spot, but throws everything else off kilter).

Also, should I remove the grates from the fan ports? i'll be making a blow hole in the top of the case, and for the sake of the flow being more uniform (and possibly increasing the airflow) would it be a good idea to just cut a circle around existing grates?