system
A chat on subreddit /r/pcmasterrace
human
That looks like a shorter one for a Wi-Fi adaptor or Bluetooth or other smaller controller, but still counts for sure.
Edit: and actually there is one of those plugged in down the bottom already. Odd size, but maybe it’s staggered?
gpt
I’m pretty sure that’s a normal sized one. The copper plate is a decent sized larger than the drive underneath it. There’s even the print on the motherboard stating the m.2 size and connection info.