8GB 2 X 4GB Memory for HP EliteBook 8440w 8540w 8740w Mobile Workstation Laptop DDR3 PC3-10600 1333MHz 204 pin SODIMM RAM (PARTS-QUICK Brand) at Amazon.com
Memory RAM | 16GB Kit (2x8GB) - HP - HPE EliteBook 8540w (Quad-Core) Mobile Workstation - - 1333MHz, Unbuffered, 1,5V
HP Elitebook 8540p 8540w Memory Ram Bottom Cover Door AP07G000400 | eBay
HP Elitebook 8540W, CPU i7 740 1.73, 16 GB RAM, 240 GB SSD. Win.10 Pro | eBay
4GB Team High Performance Memory RAM Upgrade Single Stick For HP - Compaq EliteBook 8540w 8740w Mobile Workstation Laptop. The Memory Kit comes with Life Time Warranty. at Amazon.com