is it a bad idea to place a gpu fans up? (feddit.it)

submitted 5 days ago* (last edited 5 days ago) by [email protected] to c/[email protected]

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I'm hacking together a gaming/fluid simulation pc from a lenovo thinkcentre m700 sff. I've already got everything set up. The problem is that the only riser i managed to find has a 90° bend to the left. (Looking from where the bracket would be.) The problem is that like this my only way to make it fit is to turn the 3060 fans up. With the extra psu powering it under it. With ~7 cm of clearance. (i'll make some stands to hold it properly) What i'm not sure is if it's going to make a big difference that it's going to push hot air downwards. The power supply fan runs continuously and it draws air downwards and out of the back. But i don't know if it will be enough.

What do you think. Is it going to make it get hotter a lot?

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[-] [email protected] 12 points 5 days ago

Natural convection is negligible compared to the airflow a fan provides. As long as it has room for the airflow and access to fresh air from somewhere that's all that matters. 7cm is plenty of room.

If anything fans up would be better when they're off since there's less impedance for the air to flow upwards vs smashing into the PCB.

[-] [email protected] 3 points 5 days ago

Ok. That's perfect. The only real impediment to the gpu fans is going to be a layer of mosquito screen to make less dust come through. the sides will be blocked by the case i'm building or it. And downwards other than through the psu the air can also go through the hole i've cut to let the riser through, allowing it to go through the empty side of the chassis as well. So it should be pretty mutch a straight pipe flow wise.

I was a bit wary because the only thing i've really built cooling paths for were transformers from welding machines. And those might as well be heaters.

Thanks for the info.

[-] [email protected] 1 points 5 days ago

Heat likes to go up, can you reverse the fans to have them draw in air from the bottom and push out the top?

[-] [email protected] 2 points 5 days ago* (last edited 5 days ago)

I'm not talking about extra case fans. I'm talking about the fans integrated in the gpu. + the integrated fan in the psu I can't really flip those. The most i can do is put another fan in the side of the space between the gpu and the psu to draw air outwards.

this post was submitted on 24 Jul 2025

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