This listing is for 1 8GB stick.  I have 4 available.  Never installed in my workstation.  Brand new.

Compatible with: Dell Precision Workstation 5810, Dell Precision Workstation T5810.

• Capacity: 8GB
• Speed: DDR4 PC4-17000 2133MHz
• Form Factor: 288 pin ECC Registered DIMM
• Halogen Free; ROHS; Warranty: Lifetime