Need Help – Louder Fans After Adding Rear Exhaust, Possible Airflow or AIO Issue?

[Dispanda]

Hey everyone,
 

I’m running into an issue with my cooling setup and could use some advice.
 

I recently build a PC with this case that came with 3 pre-installed front intake fans.
After that, I added a 240mm AIO at the top as my CPU cooler (exhaust configuration).

The system was running fine for over a month — temps seemed normal, and I barely heard the fans spin up, even while gaming.
 

A couple of days ago, I installed a rear 120mm exhaust fan. Ever since then, my system fans have been noticeably louder, even during idle or light use (no gaming). I'm not sure what's going on.
 

Current CPU temps are around 55°C at idle/light load, which seems a bit high, but I don’t have data from before to compare. I never had a reason to check temps earlier since everything seemed quiet and stable.
 

My guess is either:

• The rear exhaust fan is disrupting airflow near the AIO (they're fairly close to each other), and now the AIO fans aren’t working as effectively.

• Or maybe I accidentally loosened the AIO mounting when installing the rear fan, affecting contact with the CPU.

Current Fan Setup:

• Front: 3x 120mm intake (came with the case)

• Top: 240mm AIO (exhaust)

• Rear: 1x 120mm exhaust (recently added — issue started after this)

Specs:

• AMD Ryzen 5 7600X

• NVIDIA RTX 5070 Ti

Would really appreciate any help or suggestions on how to diagnose this. Should I try removing the rear fan to test airflow? Or shift the AIO more towards the front?
 

Thanks in advance!

[Dispanda]

I closed some chrome tabs and now temp is back to normal.

HTF is that even possible. 

[Electronics Wizardy]

46 minutes ago, Dispanda said:

Current CPU temps are around 55°C at idle/light load, which seems a bit high, but I don’t have data from before to compare. I never had a reason to check temps earlier since everything seemed quiet and stable.

Thats pretty normal. Where are you seeing those temps being high.

 

Have you tried changing the fan curves?

 

37 minutes ago, Dispanda said:

I closed some chrome tabs and now temp is back to normal.

The CPUs is jumping up in power usage it seems to try to run the web stuff quickly. Pretty normal from what I've seen.

[podkall]

1 hour ago, Dispanda said:

Rear: 1x 120mm exhaust (recently added — issue started after this)

What brand and model?

[JamesTuckerTPA]

Open Chrome tabs can use a lot of resources. I close out the ones I'm not using (I'm old school) or use something like sleeping tabs to make sure they aren't doing stuff in the background.

 

A colleague of mine was adamant about keeping her tabs open, even though Chrome was causing her to run out of system memory and draining her battery. She ended up killing a few dozen and she was able to work again.

 

If closing the tabs didn't fix your issues (sounds like it did from above?), or you're at least still curious, I'd take out the rear fan see what happens, then put it back in but as an intake to see what happens. I think it wold be worth the experiment to see how your PC reacts. I'd wonder what the system board temps would be with it being an intake instead of an exhaust.

 

I find messing around with airflow to be fun to see which drops the temp lowest when in 100% render mode.

[Dispanda]

On 6/13/2025 at 1:05 AM, podkall said:

What brand and model?

Corsair RS ARGB SERIES

[Dispanda]

On 6/13/2025 at 3:59 AM, JamesTuckerTPA said:

Open Chrome tabs can use a lot of resources.

I changed the setting and turned on memory saver to balanced. 

 

On 6/13/2025 at 12:25 AM, Electronics Wizardy said:

Thats pretty normal. Where are you seeing those temps being high.

 

Have you tried changing the fan curves?

 

The CPUs is jumping up in power usage it seems to try to run the web stuff quickly. Pretty normal from what I've seen.

Well honestly it runs super quiet now with all the closed tabs. I think maybe something was broken on one of the tabs and it was using alot of CPU. Although i did not visit any shady website but its possible i visited some site with CPU mining.