Question about Crucial X9 Pro

yes, a short USB-C to USB-C, about 22cm. Does what it's supposed to, at least on a Mac it's also fast, approx. 900mb/sec).

yes. USB-C to USB-C. On Macs, it works well. On the latest MacBookPro M3, it's 900Mb/s write and 920Mb/s read. But with the Crucial X10 Pro too... even though it's rated at twice the speed... but I don't know on which machine. PC perhaps?