https://www.asus.com/us/displays-desktops/mini-pcs/pn-series/asus-expertcenter-pn53/

This unit has 32 GB DDR5-4800 RAM and 500 GB SATA SSD.

NO OPERATING SYSTEM INSTALLED.

Unit has occasional problems recognizing that RAM is installed. Rebooting fixes problem generally. PC being sold as is.