View the refurbished HP 4GB (1x4GB) Single Rank x4 PC3-12800R (DDR3-1600) Registered CAS-11 Memory Kit 647895-B21 664689-001 Quickspecs here
HP Original PC3-12800 EEC Regisitered Fully Buffered DDR3-1600 Memory desigined to work in the following HP Proliant Blade, Rack and Tower Servers.