AIO fans position. Intake or exhaust?

[Flying Sausages]

Hello everyone, I need help to whether to intake or exhaust for my Corsair H115i Pro RGB mounted on top of my Corsair 750D case

 

Current setup

 

2x 140mm fans intake front

 

1x 140mm fans exhaust back

 

2x Corsair h115i Pro RGB included fans as exhaust through the rad on top of the case. The included fans mounted below the rad.

 

The thing is in gaming, my Corsair AIO liquid temp reaching 45C - 47C. Surfing the web is below 40C. CPU at stress or at 100% load is 41C - 43C.

 

I have Sapphire Pulse RX 590 that runs 80C at gaming. FL hot summer heat. Ambient in my parents house right now is 29C.

 

So should I use it for intake or exhaust? I did some researches, and it came out 50/50. 50% People suggested top as an exhaust for air convection thing like top and rear for exhaust, front and bottom intake. 50% others suggested top as intake to bring cold air to the rad to push heat trapped in the rad fins out.

[Firewrath9]

just switch it around, and see the difference. If there's a benefit or its the same, keep it there, else, switch it back.

[Flying Sausages]

Just now, Firewrath9 said:

just switch it around, and see the difference. If there's a benefit or its the same, keep it there, else, switch it back.

So if I switch it for intake, do I have mount the fans intake top of the rad or below the rad?

[LIGISTX]

You have it set up correctly already. You don't want to bring the heat from the CPU back into the case... Let the water cooler do its job which is to remove all the CPU's heat out of the case.

 

If you use your radiator as an intake, the heat from the CPU will be blow back into the case and will raise the temperature of everything else (such as your video card) as it is now being cooled by warmer air (warmer because it was blown through your CPU water cooling radiator).

[Firewrath9]

1 minute ago, LIGISTX said:

You have it set up correctly already. You don't want to bring the heat from the CPU back into the case... Let the water cooler do its job which is to remove all the CPU's heat out of the case.

 

If you use your radiator as an intake, the heat from the CPU will be blow back into the case and will raise the temperature of everything else (such as your video card) as it is now being cooled by warmer are (warmer because it was blown through your CPU water cooling radiator).

But your CPU will be cooled by hotter air, the 250W RX 590 creates a lot more heat than a 100W CPU.

The 250W chip will be heated by an extra 100W, vs a 100W cpu being heated by 250W

(I know thats not exactly how thermodynamics works)

[LIGISTX]

Just now, Firewrath9 said:

But your CPU will be cooled by hotter air, the 250W RX 590 creates a lot more heat than a 100W CPU.

Yes... But his GPU is running at 80c, and his CPU is running sub 50. CPU is running extremely cool, no reason to cool it down more while sacrificing temps on the GPU and GPU auto overclocking headroom...

 

There is almost never a situation where you would rather pump hot CPU air back into the case specifically for this reason.

[Firewrath9]

1 minute ago, LIGISTX said:

Yes... But his GPU is running at 80c, and his CPU is running sub 50. CPU is running extremely cool, no reason to cool it down more while sacrificing temps on the GPU and GPU auto overclocking headroom...

 

There is almost never a situation where you would rather pump hot CPU air back into the case specifically for this reason.

If the CPU is at 50c, that probably means his liquid temp is sub 35c. That means at most the air is going to be heated by a couple of degrees.

However, the GPU would heat up the air 20-30c, as it is creating a lot more heat. Every situation is different, which is why I told him to test it out.

[LIGISTX]

Just now, Firewrath9 said:

If the CPU is at 50c, that probably means his liquid temp is sub 35c. That means at most the air is going to be heated by a couple of degrees.

However, the GPU would heat up the air 20-30c, as it is creating a lot more heat. Every situation is different, which is why I told him to test it out.

Yes, every situation is different, but thermodynamics is thermodynamics... If you are going to heat up the air going into the case, even by 1c, your going to heat up the GPU by 1c. Why blow hot air air into the case when you already invested and properly set up a cooling solution that dumps the heat out of the case entirely.

 

Remember, in this situation, there is no reason to cool the CPU more, its already running extremely cool. There is no benefit to reduce CPU temps, at all. sub 50 is beyond phenomenal. The issue here is the GPU at 80c, its hitting a thermal wall. Pumping more heat into the system will only make it hit this wall faster, and result in the GPU not hitting as high GHz as its at its temp threshold.

 

There is always room for scientific discovery and hypothesis testing, but there isn't much reason to test out what pumping hot air into a case will result in, it will result in a cooler CPU at the sacrifice of everything else running warmer... 

[SolarNova]

Its always best to have rads exhaust so long as u have good case airflow. this stops warmed air from the rads being pumped into the case.

[Flying Sausages]

1 hour ago, LIGISTX said:

Yes... But his GPU is running at 80c, and his CPU is running sub 50. CPU is running extremely cool, no reason to cool it down more while sacrificing temps on the GPU and GPU auto overclocking headroom...

 

There is almost never a situation where you would rather pump hot CPU air back into the case specifically for this reason.

 

58 minutes ago, LIGISTX said:

Yes, every situation is different, but thermodynamics is thermodynamics... If you are going to heat up the air going into the case, even by 1c, your going to heat up the GPU by 1c. Why blow hot air air into the case when you already invested and properly set up a cooling solution that dumps the heat out of the case entirely.

 

Remember, in this situation, there is no reason to cool the CPU more, its already running extremely cool. There is no benefit to reduce CPU temps, at all. sub 50 is beyond phenomenal. The issue here is the GPU at 80c, its hitting a thermal wall. Pumping more heat into the system will only make it hit this wall faster, and result in the GPU not hitting as high GHz as its at its temp threshold.

 

There is always room for scientific discovery and hypothesis testing, but there isn't much reason to test out what pumping hot air into a case will result in, it will result in a cooler CPU at the sacrifice of everything else running warmer... 

My cpu 3700x 75C while playing BF5.

 

42 minutes ago, SolarNova said:

Its always best to have rads exhaust so long as u have good case airflow. this stops warmed air from the rads being pumped into the case.

I think my case has decent airflow but I can feel the heat coming out of my rad right now as an exhaust.

[LIGISTX]

1 hour ago, OlympicAssEater said:

 

My cpu 3700x 75C while playing BF5.

 

I think my case has decent airflow but I can feel the heat coming out of my rad right now as an exhaust.

O, what happened to the original post when you said the CPU was at 41-43 while under load? But even so, 75c is pretty warm, but nothing to be worried about. I still wouldn't advise you pumping the CPU's heat into the case, it will just make everything warmer. Maybe add an intake fan in the front of the case if you don't have one.

 

And yes, you will always feel the heat coming out of the radiator, thats the point of it. It takes the heat from the CPU, warms up the water in the loop, and then the heat is exhausted from the radiator.

[Flying Sausages]

59 minutes ago, LIGISTX said:

O, what happened to the original post when you said the CPU was at 41-43 while under load? But even so, 75c is pretty warm, but nothing to be worried about. I still wouldn't advise you pumping the CPU's heat into the case, it will just make everything warmer. Maybe add an intake fan in the front of the case if you don't have one.

 

And yes, you will always feel the heat coming out of the radiator, thats the point of it. It takes the heat from the CPU, warms up the water in the loop, and then the heat is exhausted from the radiator.

41 to 43c is the aio liquid temp not cpu temp.

Wouldn't too much heat will dry out the liquid like in my case? When gaming my case ambient is hit due to my gpu 80c heat. 

[LIGISTX]

20 hours ago, OlympicAssEater said:

41 to 43c is the aio liquid temp not cpu temp.

Wouldn't too much heat will dry out the liquid like in my case? When gaming my case ambient is hit due to my gpu 80c heat. 

What do you mean will dry out the liquid? As in will it evaporate from the water loop?

 

If that is the question, no it will be fine. It’s designed with that in mind. Will it last 5+ years like that, maybe not, but it’ll last “a reasonable amount of time”.

 

You can always turn the fans on the GPU up some of your worried about the heat on the GPU core. It won’t reduce your case temps, but it will made the GPU run cooler.

 

The only thing you can do to drop case temps is increase airflow, more intake fans or more aggressively tuned exhaust fans to help suck the air in the case which will replenish it with fresh air. But, all that said, 80c on the GPU is “fine”, it’s on the warm side, but it’s “fine”. The CPU hitting 75 under a game load is pretty insane. But BF V is a pretty cpu hungry game. Still shocking it gets that hot tho. Could try and up the RPM on those fans as well if you have the ability to do so. But 75 is also “fine”. 

[Velcade]

Kyle knows...

[Flying Sausages]

On 10/28/2019 at 8:22 PM, LIGISTX said:

What do you mean will dry out the liquid? As in will it evaporate from the water loop?

Like the heat will shorten out the liquid lifespan?

 

On 10/28/2019 at 8:22 PM, LIGISTX said:

What do you mean will dry out the liquid? As in will it evaporate from the water loop?

 

If that is the question, no it will be fine. It’s designed with that in mind. Will it last 5+ years like that, maybe not, but it’ll last “a reasonable amount of time”.

 

You can always turn the fans on the GPU up some of your worried about the heat on the GPU core. It won’t reduce your case temps, but it will made the GPU run cooler.

 

The only thing you can do to drop case temps is increase airflow, more intake fans or more aggressively tuned exhaust fans to help suck the air in the case which will replenish it with fresh air. But, all that said, 80c on the GPU is “fine”, it’s on the warm side, but it’s “fine”. The CPU hitting 75 under a game load is pretty insane. But BF V is a pretty cpu hungry game. Still shocking it gets that hot tho. Could try and up the RPM on those fans as well if you have the ability to do so. But 75 is also “fine”. 

3700x is a hot a cpu.

 

On 10/28/2019 at 9:35 PM, Velcade said:

Kyle knows...

What is open card? Can my h115i pro rgb fit on the front of Corsair 750D case?

[LIGISTX]

So.... this makes no sense from a physics perspective. But, that is likely because of the massive amount of variables. The fact the GPU doesn't get any warmer at all with the rad in front vs on top means there is airflow being injected into the case from somewhere else, and in a big way. Is that due to somehow the radiators heat being extracted extremely optimally which necessitates drawing in cold air from the bottom case openings, or through the PCI case brackets, who knows, to many variables to understand the entire system. But, if you pump heat in, there is no way the parts inside the system don't get warmer. The CPU running warmer is expected, but the GPU running the exact same temp makes no sense at all. ¯\_(ツ)_/¯ 

[Velcade]

On 10/29/2019 at 6:26 PM, OlympicAssEater said:

What is open card?

^^^Blower

^^^Open