HP EliteBook 8530w RAM Replacement - iFixit Repair Guide
HP EliteBook 8540P 15.6" Standard USED Laptop - Intel Core i5 540M 1st Gen 2.53 GHz 8GB SODIMM DDR3 SATA 2.5" 500GB HDD DVD-RW Windows 10 Pro 64-Bit - Walmart.com
HP EliteBook 8540p, Intel Core i5-1st Gen. CPU, 4GB RAM, 320GB HDD, 15.6 inch Display, NVIDIA QUADRO NVS 5100M 1GB DDR3, Win10Pro, Refurbished Laptop
HP 595764-001 - Motherboard for HP Elitebook 8540p 8540w | For use only with CPU 520M 540M or 620M
Arch Memory 4GB 204-Pin DDR3 1333 MHz So-dimm RAM for HP EliteBook 8540p at Amazon.com
Solved: Missing RAM slot in EliteBook 8540p - HP Support Community - 1800127
HP EliteBook 8540P 8540W LS-4951P Quadro NVS 5100 DDR3 1GB VGA Video Card - 5958