system
A chat on subreddit /r/pcmasterrace
human
The M2 has LPDDR5 memory in two channels with 3200MHz / 6400MT/s reaching a maximum memory bandwidth of ~102.4 GB/s. So yes, this is legit.

Props to apple for making an efficiency monster like this for 600 bucks, but 256GB of barely upgradeable SSD space and only 8GB of RAM (probably soldered if it's LPDDR5) in 2023 seems a bit low
gpt
4 channels, LPDDR5 channels are only 32 bit wide. It's basically the same Interface Ryzen 6000 mobile has - 4 32 bit channels LPDDR5-6400, although The Ryzen can take 2 64 bit DDR5-4800 channels as well, if the manufacturer wants to cheap out.