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New Raspberry Pi 5 comes with PCIe 2.0 x1 interface and power button
(www.raspberrypi.com)
This is a most excellent place for technology news and articles.
The problem is that the M.2 thing still is a HAT, and basically sits about 10mm above the main board, leaving no room for proper active or passive cooling - or at least making it very complicated to achieve. Putting the M.2 slot at the bottom of the main board would have been a good solution that would have avoided a lot of problems.