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The setup is only cpu, by this i mean the gpu is not in the enclosure but connected and drawing power. There is a large opening on the bottom, the psu draws the air in and vents it out. The only other fan is the cpu cooler. The airflow is in the path of the cpu cooler but unobstructed. The cpu has 95w TDP, stock settings, no overclocking of course. The intended psu would be a 50 celsius rated operating temperature psu, example: https://www.bequiet.com/en/powersupply/387 . This psu also has a larger fan and the airflow direction of the psu and cpu fans are the same. The psu is close to the cpu heatsink https://noctua.at/en/nh-l12s but not to close ,15mm. This would be almost a push\pull configuration while the pull part is also the vent. Also i attached here a scientific study performed on a 115 tdp pentium iv. https://www.researchgate.net/publication/257985684_Studies_of_Heat_Transfer_From_PC_Processor_to_the_Air_Cooled_Heat_Sink . From what i understand this study shows that the cpu only (ssd, motherboard, ram - but not the gpu) should not heat up the air temperature above 50 celsius (max 95w tdp).

Questions: 1.Does the PSU overheat? 2.How does the PSU react when power consumption is low but hot air is blown in from the cpu cooler?

If i am wrong please correct me.

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    You should explain this a little bit better. What are you trying to get? Are you trying to create a similar setup? You should start the question explaining what you want. – Carles Dec 1 '20 at 10:17
  • The point would be will it stay in a safe range and provide enough airflow. How high can i go on the cpu tdp ? And how low can i go on the psu? Example only a 120mm fan psu with 40 celsius operational temperature. – Lambo the Typer Dec 1 '20 at 10:23
  • Does the psu overheat? – Lambo the Typer Dec 1 '20 at 10:25
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    Do you mean that both fans are face one in fron of the other? In that case, while the airflow of the PSU fan is higher thatn the airflow of the CPU, everything should be fine. In case that the CPU airflow is higher, then it can slow down the fan for the PSU, so the temp sensor which is inside the PSU will detect a higher temperature and will speed up the fan. In case of facing fans, one offers resistance to the other, so the best solution would be to break this effect using some kind of blocking piece in the midle that would direct airflow to a different direction, like two-sided ramp block – Carles Dec 1 '20 at 10:56
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    See superuser.com/questions/1529880/… for a lesson in air-flow design. You can have all the fans in the world but if they're set up badly they won't work nearly so well. – Tetsujin Dec 1 '20 at 14:17

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