Whats Better GPU Radiator Fans Blowing In Or Out Of Case- Push Pull?

[ccoo84]

So I am building a new rig with Nzxt G12 water cooled Titan XP Sli with 2 krekan X41 140" Radiators- I am going to be putting the fans on & was wondering would it be better to have the radiator sandwiched between 2 fans facing out of the case rear in push pull or in the push pull facing inward giving air to the case? Also I was wondering if Fan sandwich actually helps in performance because I'v read different peoples reasonings.. Still not quite sure.. thank you

 

[feelinfroggy777]

I have 2 1080ti's water cooled and I have them both running push/pull (sandwhich). But honestly, I dont think it will mater. Your Titans will be running well below the thermal throttle to even matter the 5 degrees you might save. My temps never go above 50C.

If you have an air cooler on your CPU, you might want them to push air out of the case, just so it does not put hot air on your CPU cooler.

The fans you ruse should be your primary focus though, bad fans will be loud. I have corsiar ml pro 120mm and they are very nice. So you might want to take a look at those if you think your rig is too loud.

 

[ccoo84]

yeah I have my CPU watercooled with nzxt x62, Nzxt just kinda happened never, not a fan boy lol. I have 6 140" Corsair red Led quite edition fans on the way.. So would it still make a difference trying to get air into the case or try to get the heat dissipated & out of the case?

 

[william p]

Blowing out keeps the heat from warming other components inside the computer, BUT you must be sure to provide airflow to things like the VRM chips next to the CPU. This is a very common mistake with H2O systems.

 

[USAFRet]

The eternal question...blowing in or blowing out.

Some people will categorically state that fans on a radiator must be blowing in, no exceptions.
Other people state the opposite.

In reality, it is whatever works in your case.
I saw a graph from NZXT the other day....at most, a couple of degrees difference.

 

[jimmyEatWord]

if it blows in , it will heat up your motherboard

 

[USAFRet]

if it blows in , it will heat up your motherboard

True.
But the argument from the other side is that you are drawing in cool air from outside, through the radiator...

 

[jimmyEatWord]

if it blows in , it will heat up your motherboard

True.
But the argument from the other side is that you are drawing in cool air from outside, through the radiator...

that could be only true for a super strong , fast spinning fan which i think does not exist at all .

 

[USAFRet]

if it blows in , it will heat up your motherboard

True.
But the argument from the other side is that you are drawing in cool air from outside, through the radiator...

that could be only true for a super strong , fast spinning fan which i think does not exist at all .

No, I meant a rad mounted on the front, with fans taking in cool air from outside.

 

[jimmyEatWord]

if it blows in , it will heat up your motherboard

True.
But the argument from the other side is that you are drawing in cool air from outside, through the radiator...

that could be only true for a super strong , fast spinning fan which i think does not exist at all .

No, I meant a rad mounted on the front, with fans taking in cool air from outside.

i'm not sure dude , i've only had pre-built closed loops but wouldn't a rad with fans outside ,, blowing the air inside , make it even worse ? !

 

[william p]

"that could be only true for a super strong , fast spinning fan which i think does not exist at all . "
https://www.youtube.com/watch?v=Wqc72EOuteU
if the fan is blowing hot air out then cold air must be coming in somewhere else.
Here's the 2 motor fan I used in the Dell e520 in my sig. It fit right in the OEM mounting.
https://www.youtube.com/watch?v=sIJUYHetJWs

 

[USAFRet]

Bottom line...there is no 100% definitive answer either way.

Whatever works with your equipment and your case.

 

[jimmyEatWord]

"that could be only true for a super strong , fast spinning fan which i think does not exist at all . "
https://www.youtube.com/watch?v=Wqc72EOuteU
if the fan is blowing hot air out then cold air must be coming in somewhere else.
Here's the fan I used in the Dell e520 in my sig. It fit right in the OEM mounting.
https://www.youtube.com/watch?v=sIJUYHetJWs

well the air is never cold technically lol , but the intake should be the front fan , like i have a 240 mm fan in the front

i watched that video , can you even play games without freaking out using such fans ? i don't know what sorts of fans custom loop designers use , but that's damn loud

 

[jimmyEatWord]

Bottom line...there is no 100% definitive answer either way.

Whatever works with your equipment and your case.

i agree , someone gave me a link to a youtube video about the pull instead of push thing , but his argument was the dust that gathers in between the rads and not the air flow ..

 

[USAFRet]

Bottom line...there is no 100% definitive answer either way.

Whatever works with your equipment and your case.

i agree , someone gave me a link to a youtube video about the pull instead of push thing , but his argument was the dust that gathers in between the rads and not the air flow ..

Right.
Generally, fans pushing air through the rad is preferred.
Either front intake or top exhaust.

That way...any 'dust' tends to collect on the fan blades instead of on the radiator fins.
And the fans are easier to clean....remove and clean if necessary.

 

[ccoo84]

ha thanks guys

 

[william p]

[


i watched that video , can you even play games without freaking out using such fans ? i don't know what sorts of fans custom loop designers use , but that's damn loud [/quotemsg]

The people who use those fans run them at very low % PWM on custom controllers.. They reach higher speeds at lower % so they start cooling sooner. I just posted that to show there are powerful fans. The 2nd video is a fan I actually use and it's much quiter. It almost never goes over 40% PWM. I couldn't find a video of my current fan the AFC1512DG 150mmX50mm monster that draws 1.8A (normal for a Dell) and only turns about 2000rpm.

 

[rubix_1011]

Here is what is going to either upset you or make you feel better.

Is the air coming out of the radiator due to fan airflow hot or just mildly warm? If hot, the cooling delta of the cooler itself is not able to provide the cooling capacity the component requires. This is referred to as a poor delta-T.