8GB 2 X 4GB Memory for HP ProBook 4530s DDR3 PC3-10600 SODIMM RAM (PARTS-QUICK Brand) at Amazon.com
A-Tech 8GB Replacement for HP 669324-B21 - DDR3 1600MHz PC3-12800 ECC Unbuffered UDIMM 2rx8 1.5v - Single Server Memory Ram Stick (669324-B21-ATC) at Amazon.com