Quick overview from the supplier:
Dell Optiplex 3090 MFF Black (Core i3-10105T 3.0-3.9 GHz, 8GB RAM, 256GB SSD, WiFi, Ubuntu)
Product Family : Dell Optiplex 3090
Case Form Factor: MFF
CPU : Intel Core i3-10105T (4C / 8T, 3.0-3.9GHz, 6MB)
RAM : 1x 8GB DIMM DDR4-2400 (two 288-pin DIMM sockets)
HDD : 256GB SSD M.2 PCIe NVMe
Card Reader no
Optical drive No
Graphics : Integrated Intel UHD Graphics 630
WLAN : no
5 x USB3.2 Gen 1
2 x DP
1Gb LAN (RJ-45)
Keyboard : Dell KB216 Multimedia USB Keyboard
Mouse : USB Dell MS116, Black
PSU 65 watts
Ubuntu
Maincase : Black