Replying to MrMik

You get good results with a 200mm Noctua fan on top of the Apollo, and a fan with less than 2000rpm minimum speed in place of the original fan. Quiet enough to gently heat a bedroom, but only with a silent power supply. The stock power supply is much much louder than an Apollo modified as above. I use San Ace 92 9GA0912P4J031
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The Bullish ₿itcoiner 1y ago

Sounds good. Got any pictures of this setup? Would like to see how it looks, especially the 3D-printed adapter.

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MrMik 1y ago

The screenshot of OpenScad model ended up at the end of the code. Here it is again:

4 small cable ties can be used to secure the adapter to the fan grill on the Apollo. But it can also just sit on top loosely.

The Noctua 200mm fan comes with a splitter cable that can be used to power the Noctua at it's full 800rpm while the 90mm fan is running with pwm variable speed.