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I took off the outer heatsink case to reduce weight on the usb port.
The m.2 drive still has a heatsink, and I stuck a gpu vram heatsink on the bridge chip (on side of pcb not shown)
I'm glad this JMicron usb-nvme bridge works well with the linux UAS driver, but the previous Realtek chip was faster, albeit very unstable.
I see mentions around the web about possibly using different firmware for the Realtek chip. I'll have do more research.
This will all be a lot less necessary once the m.2 HATs and PCIe breakout boards are released.
Nice bit of info on the PCIe expansion of the Rpi5:
https://www.jeffgeerling.com/blog/2023/testing-pcie-on-raspberry-pi-5