Two M.2 expansion slots. One M.2 socket 1, type 2230 for WLAN. One M.2 socket 3, Key M, type 2280 for SSD.

Up to 32GB of DDR3 SDRAM across four DIMM slots.

The PCIe slot is limited to 75W (no external PSU cables). The best GPU you could install in 2021 without modding was a GTX 1650 or RX 6400 (low-profile for SFF).