I wasn't expecting this to be so hard. I ordered an RK3588 based Orange Pi 5+ a while back as a development platform. It's great. A good combination CPU and GPU power. As well as a very competitive price to performance ratio. I also bought a large heat sink for it. However it kept hitting thermal limit under heavy use. Yet, I wasn't able to find a 5V fan that would fit on top of the heat sink. Even more so, I can't find any documentation about the GPIO pins.
=> Official product page of the Orange Pi 5+
Today, I accidentally found a 5V fan for the Raspberry Pi in a local electronics store, for cheap (about 1.3 USD). I bought it immidiately. and got back home to try it out. I tried Googling for figure out the orientation of the GPIO pins and locate where the 5V pin is. I just can't get it working. Until I found the following image on Google. Then some more luck finding a high resolution version of it on Taobao.
=> GPIO pinout of the Orange Pi 5+
Somehow this is shown on an Amazon page for the Orange Pi 5+. But I can't find a high resolution version of it after following the link. Anyway, this is what I need. I connected the fan to the 5V and GND pins. And it works! Now the CPU temperature is only 50 degrees Celsius under coninuous heavy load.
=> The finished assembly, My fan is stuck to the heat sink with foam tape
In case anyone needs a close up shot for connecting a fan to the Orange Pi 5+, here it is:
Running stress -c 8 for 10 minutes, the CPU temperature is ~50 degrees Celsius while ambient temperature is ~26 degrees Celsius. I'm very happy with this result.
The only complain I have is that the fan is a bit noisy and does not turn off when the board is powered off. I can solve it by doing a bit of wiring, connecting the fan to 3.3V instead. And add a switch to turn it on and off. But for now, it's good enough.
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