foone🏳️⚧️ on Twitter: "ar in ##whitequark has alerted me that there's a "asus dimm.2" form factor, which is a way to hook up m.2 drives to special ram slots on ASUS motherboards.
4GB 2 X 2GB PC2-5300F 667MHz 240 pin DDR2 SDRAM ECC Fully Buffered FB DIMM Server Low Power Memory for HP Workstation XW8600 (PARTS-QUICK BRAND). Equivalent to HP Part Numbers: 397413-B21, 442823-B21,
Transcend JM2GDDR2-6K (2GB DDR2 PC2-5300U 667 MHz LP DIMM 240-pin) RAM Kit of 2 | 1GB | Team Spares
ASUS DIMM.2 is an M.2 Riser Card | TechPowerUp
Kingston Technology 2 GB (1x2 GB Module) 1333MHz DDR3 PC3-10600 240-Pin Single Rank DIMM Memory for Select HP/Compaq Servers KTH9600BS/2G at Amazon.com