NOKOTION 595765-001 595764-001 For HP 8540P 8540W Laptop Motherboard KAQ00 LA-4951P MAIN BOARD QM57 DDR3 Free CPU - AliExpress
4GB Team High Performance Memory RAM Upgrade Single Stick for HP - Compaq EliteBook 8540p (Quad Core Processors) Laptop. The Memory Kit Comes with Life Time Warranty. at Amazon.com
CMS 4GB (1X4GB) DDR3 10600 1333MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with HP/Compaq® Elitebook 8440P, 8440W, 8460P Ddr3 - A30 at Amazon.com
OFFTEK 8GB Replacement Memory RAM Upgrade for HP-Compaq EliteBook 8470p (DDR3-12800) Laptop Memory at Amazon.com