I recently got my hand on a cirrus7 nimbini passive cooled SFF PC and decided to put an Ryzen 7840HS board in it (instead of an INTEL NUC)
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I was eying the nimbini series for quite a while now, but unfortunately they only come with Intel CPUs - good luck I still had a AOOSTAR GEM10 7840HS board which is just about the same size like the INTEL/ASUS NUCs
In order to fit the AOOSTAR GEM10 inside the nimbini, I had to do a couple of mods...
First, I machined a custom coldplate for the GEM10 board - the coldplate will also cover the VRMs and memory chips
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because the AOOSTAR board has the I/O connectors "upside down" (compared to the NUC) I needed some copper block to offset the GEM10 from the original mounting position in the nimbini case - the poor INTEL cooler needed some convincing but finally I could harvest that nice piece of copper block...
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fitment testing and taking some measurements to see if it all lines up...
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the custom coldplate and original nimbini coldplate are soldered together with the copper "spacer" in between...
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test mounting with custom 3D printed I/O shields ...
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please ignore the fan, I put it in "for safety" but it's actually not being used - turns out that the case cools well enough without additional airflow, even at 45W TDP
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final assembly and connection of the board - of course the NVME drive will also be cooled by the case, using 3mm thermal pads
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after about 20 minutes of stress testing @45W the temperature stabilizes well below 80C
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and yeah, gaming performance is also quite good for a passive cooled SFF PC of that size
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hope you liked this quick build 
