Required fans

[Spoopatroopa]

So doing a new build but for first time ever I'm not using any HDD's. I'm going to have two 2.5" SSD's mounted on back of case. So my question is in regards to number of fans needed. I have a Kraken NZXT AIO for my CPU which will be mounted on top and one rear exhaust fan. So for the front I have 3 120mm thermaltake fans. I'm going to use the two for the top and middle but do I need that third one for bottoms since I won't have any HDD's to cool? Here is my case. 

https://www.newegg.com/white-corsair-4000d-airflow-atx-mid-tower/p/N82E16811139157?Item=N82E16811139157&nm_mc=AFC-RAN-COM&cm_mmc=AFC-RAN-COM&utm_medium=affiliates&utm_source=afc-PCPartPicker&AFFID=2558510&AFFNAME=PCPartPicker&ACRID=1&ASID=https%3a%2f%2fpcpartpicker.com%2f&ranMID=44583&ranEAID=2558510&ranSiteID=8BacdVP0GFs-a0_dSfSQVUG4mjcxb1kHdA

[Lurick]

It's not necessary but it's up to you if you find it aesthetically pleasing or not is all

[aDoomGuy]

You don't need it and tell you what. Take the bottom front fan and place it just in line with the PSU shroud and I think that will be more effective at providing your graphics card with fresh air than with 3 fans in the front. So you'll have one fan providing air to the VRM area and the radiator and one for the graphics card. Sounds sensible?

[Spoopatroopa]

ohhh you mean place the third fan on the top of the case with it pulling air in?

[Ralfi]

Great case! 
 

When I built my PC last year using the 4000D, I ran some tests with 0,1,2,3 front fans. I’ve since altered my fan profiles & changed my CPU fan (& perhaps more but can’t recall), but here’s some stats you can use as reference…

 

Under Load…

 

3 x Front fans-GPU under load

‘Quiet’ Fan Profile for CPU/Case fans. GPU fans @ default restricted PWM threshold (66%)…

• CPU (120mm x1); 1010RPM
• Rear exhaust (120mm x1); 642RPM
• Top exhaust (120mm x1); 635RPM
• Front intake (120mm x3); 567RPM
• GPU (80mm x2); ~1567RPM

Noise: 39dB Average 

Temps: 98° (GPU Hot Spot), 86° (GPU), 42° (CPU)

 

2 x Front fans-GPU under load

‘Quiet’ Fan Profile for CPU/Case fans. GPU fans @ default restricted PWM threshold (66%)…

• CPU (120mm x1); 1009RPM
• Rear exhaust (120mm x1); 635RPM
• Top exhaust (120mm x1); 636RPM
• Front intake (120mm x2); 564RPM
• GPU (80mm x2); ~1500RPM

Noise: 39dB Average

Temps: 99°, 85°, 42°

 

1 x Front fan-GPU under load

‘Quiet’ Fan Profile for CPU/Case fans. GPU fans @ default restricted PWM threshold (66%)…

• CPU (120mm x1); 926RPM
• Rear exhaust (120mm x1); 549RPM
• Top exhaust (120mm x1); 544RPM
• Front intake (120mm x1); 549RPM
• GPU (80mm x2); ~1290RPM

Noise: 38dB Average

Temps: 95°, 83°, 39°

 

No Front fans-GPU under load

‘Quiet’ Fan Profile for CPU/Case fans. GPU fans @ default restricted PWM threshold (66%)…

• CPU (120mm x1); 983RPM
• Rear exhaust (120mm x1); 628RPM
• Top exhaust (120mm x1); 602RPM
• GPU (80mm x2); ~1418RPM

Noise: 38dB Average

Temps: 97°, 85°, 44°

Idle…

 

 

3 x Front fans-GPU Idle

‘Quiet’ Fan Profile for CPU/Case fans. GPU fans @ default restricted PWM threshold (66%)…

• CPU (120mm x1); 966RPM
• Rear exhaust (120mm x1); 609RPM
• Top exhaust (120mm x1); 591RPM
• Front intake (120mm x3); 569RPM
• GPU (80mm x2); 0RPM

Noise: 37dB Average

50-48-37°

 

2 x Front fans-GPU Idle

‘Quiet’ Fan Profile for CPU/Case fans. GPU fans @ default restricted PWM threshold (66%)…

• CPU (120mm x1); 996RPM
• Rear exhaust (120mm x1); 643RPM
• Top exhaust (120mm x1); 616RPM
• Front intake (120mm x2); 576RPM
• GPU (80mm x2); 0RPM

Noise: 37dB Average

51-49-38°

 

1 x Front fan-GPU Idle

‘Quiet’ Fan Profile for CPU/Case fans. GPU fans @ default restricted PWM threshold (66%)…

• CPU (120mm x1); 956RPM
• Rear exhaust (120mm x1); 574RPM
• Top exhaust (120mm x1); 559RPM
• Front intake (120mm x1); 551RPM
• GPU (80mm x2); 0RPM 

Noise: 35dB Average

53-50-38°

 

No Front fans-GPU Idle

‘Quiet’ Fan Profile for CPU/Case fans. GPU fans @ default restricted PWM threshold (66%)…

• CPU (120mm x1); 970RPM
• Rear exhaust (120mm x1); 612RPM
• Top exhaust (120mm x1); 580RPM
• GPU (80mm x2); ~547RPM 

Noise: 36dB Average

53-51-49°