The Raspberry Pi M.2 HAT+ enables you to connect M.2 peripherals such as NVMe drives and AI accelerators to Raspberry Pi 5’s PCIe 2.0 interface, supporting fast (up to 500 MB/s) data transfer to and from NVMe drives and other PCIe accessories.
Raspberry Pi 5’s single-lane PCI Express 2.0 interface is exposed on a 16-pin, 0.5mm- pitch FPC connector; the M.2 HAT+ M Key is a mechanical adapter board that convert sbetween this connector and a subset of the M.2 standard. It supports devices that have the M.2 M key edge connector, in the 2230 and 2242 form factors. It is capable of supplying up to 3A to connected M.2 devices. The Raspberry Pi M.2 HAT+ conforms to the Raspberry Pi HAT+ specification and is auto-detected by the latest Raspberry Pi software/firmware. It is supplied with a 16mm stacking header and threaded spacers, so it can be fitted to a Raspberry Pi 5 with the Raspberry Pi Active Cooler in place.
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Based on 1 ratings:
I can't really say anything about it's performance because I can't install it the way I want. First, I have my Pi 5 mounted to a touch screen display. The mounting kit provided assumes M.2 Hat is the only thing mounting to the Pi 5 other than a cooling fan. If there's something else, then you have to come up with 2 mm threaded studs to with the spacers. I had some of these screws and cut off the heads; that worked, but too much "DIY".
Second, and the worst problem, is the that pins on the header they supply for the GPIO are not long enough! They should be at least 6 mm (1/4") longer. As they are, you cannot access the GPIO pins. In my case, I was using them for power for the touch screen display, but even without that display, the GPIO is an essential feature of the Raspberry Pi series.