2GB PC3-10600 DDR3-1333MHz ECC Registered CL9 240-Pin DIMM 1.35V Low Voltage Single Rank HYNIX Memory Module Mfr P/N HMT325R7CFR8A-H9 at Amazon .com
A-Tech 2GB Replacement for HP 501540-001 - DDR3 1333MHz PC3-10600 ECC Unbuffered UDIMM 2rx8 1.5v - Single Server Memory Ram Stick (501540-001-ATC) at Amazon.com