Case fan setup.

Toggle sidebar Toggle sidebar
kol12

kol12

Honorable
Jan 26, 2015
2,109
0
11,810
I've got a question regarding fan setup. I don't fully understand the positive/negative pressure thing, one of them reduces dust intake correct? I want to replace the two stock Corsair AF140L's I have mounted at the top of my Corsair Obsidian 450D as exhaust fans. I've sort of decided on the Corsair AF140's quiet non led edition which has higher CFM (67.8). I have two Noctua NF-P14S Redux 140mm at the front of my case as intake but I was thinking instead of getting the AF140's I could get something with higher rpm for my intake fans and move the Noctua's to exhaust.

The Noctua NF-P14S are 1200RPM max. Will I benefit from more RPM for intake?
 
Sort by date Sort by votes
J

JanHyka

Commendable
Jun 24, 2016
110
0
1,710
RPM are just part of fan's performance, so what you need to compare is CFM, where higher = better. But, it's not that simple. It is considered better to have a bit of positive pressure in the case (total CFM in > total CFM out) as it cools the components better. If you turn positive pressure in a negative one (Ie CFM out > CFM in), then the cooling will get worse.
 
Upvote 0 Downvote
kol12

kol12

Honorable
Jan 26, 2015
2,109
0
11,810
So negative pressure is higher CFM to exhaust or out? Is a balanced intake/outtake CFM ideal or is a higher intake CFM ok?

The Noctua Redux I have are already 78.7 CFM so I guess the Corsair AF140 (67.8) would be a good match?
 
Upvote 0 Downvote
BottleGamer

BottleGamer

Honorable
Sep 30, 2015
370
1
10,965
You want your intake to let enough air in your pc to most effectively cool your components so a higher rpm isnt wront, but too much rpm could cause that youre pulling in too much air so the heated up air stays in your system until your exhaust can catch up
I'd go with a possitive pressure since its more effective ( thats just my personal opinion)
Do you only have the top ones as exhaust or also a rear fan to exhaust ?
 
Upvote 0 Downvote
kol12

kol12

Honorable
Jan 26, 2015
2,109
0
11,810


I have a Corsair H80i GT mounted to the rear as exhaust.
 
Upvote 0 Downvote
BottleGamer

BottleGamer

Honorable
Sep 30, 2015
370
1
10,965
I'd inform myself at the website JanHyka posted and see what fits yourself the best
In my personal opinion i would take the top fans and the front fans as intake and the rear fan as an exhaust
And if the temperatures/dust settling isnt okay for you, you can still change the setup
 
Upvote 0 Downvote
kol12

kol12

Honorable
Jan 26, 2015
2,109
0
11,810
The Noctua Redux I have are the 1200 rpm version that's actually 64.9 CFM. The 1500 rpm are 78.7 CFM. That means the Corsair AF140 have a higher CFM (67.8) that I was planning on using as exhaust.
 
Upvote 0 Downvote
BottleGamer

BottleGamer

Honorable
Sep 30, 2015
370
1
10,965

You could use basically every fan with a decent airflow but these are also great
I for example just got two corsair af 140 and they do great
 
Upvote 0 Downvote
kol12

kol12

Honorable
Jan 26, 2015
2,109
0
11,810


These ml140 can push more air than the AF140 by the look of it...

I was going to get the AF140 for exhaust but I've noticed they've got a slightly higher CFM than than my Noctua redux as intake. I could swap them around but I was keen on the look of the AF140's at the top of my case.

The other option I suppose is making them intake at the top of the case like you suggest but that only leaves my H80i GT as an exhaust and I'm concerned that that's not going to provide enough exhaust CFM.
 
Upvote 0 Downvote
BottleGamer

BottleGamer

Honorable
Sep 30, 2015
370
1
10,965

To be absolutely honest: It probably wont affect your temps that much
I got 5 intake fans on my watercooling build and one exhaust and still achieve got temperatures so just try stuff out and see whats right for you
I didnt pay that much attention to cfm, just that i got some decent airflow fans to circulate the air in my case
So there's really not a "wrong" thing for you to do ( except all intake or all exhaust )
 
Upvote 0 Downvote
kol12

kol12

Honorable
Jan 26, 2015
2,109
0
11,810


what won't affect my temps too much? Higher CFM or having my top mount fans as intake rather than exhaust?
 
Upvote 0 Downvote
You must log in or register to reply here.

TRENDING THREADS

Latest posts

Moderators online

Share this page

COMPANY
RESOURCES
FOLLOW
Top Bottom