So i recently build a SFF PC in The Fractal Terra and wanted to do some tests regarding Fan Layouts for the best thermals possible.

https://preview.redd.it/a7iboebrhw7d1.png?width=3024&format=png&auto=webp&s=97093cf02df34f2dad9cec66e44ff14d20f2bf38

https://preview.redd.it/31kzp5sx2q7d1.png?width=4032&format=png&auto=webp&s=eb8accadaf72bbd422d6140d3f9f9f0317dbd3ae

https://preview.redd.it/ej5phfhriw7d1.png?width=3024&format=png&auto=webp&s=f440bd2acc57a3259f85919b46f3036664e19625

So i tested different Fan Layouts but the differences seemed to be marginal.

For the test i just ran Helldivers 2 for 20 Min each with :

With these settings the PC is nearly dead silent.

2x 120 mm Bottom Intake no Top
CPU: 72,8°C
GPU: 57,4°C

2x 120 mm Bottom Intake 80mm Top out
CPU:71,3°C
GPU 56,9°C

No Fans
CPU: 74,1°C
GPU: 58,1°C

2x 120 mm Bottom Out
CPU: 75,2°C
GPU: 55,9°C

UPDATE

2x 120 mm Bottom Front OUT Back IN
CPU: 74,4°C
GPU: 56,5

2x 120 mm Bottom Front OUT Back IN CPU Inverted
CPU: 69,3°C
GPU: 58,6°C

2x 120 mm Bottom IN CPU Inverted
CPU: 69,7°C
GPU: 59,2°C

2x 120 mm Bottom OUT CPU Inverted
CPU: 70°C
GPU: 58°C