HP EliteBook 8540w MXM Upgrade Quadro K2200M (Maxwell) - YouTube
Upgrading memory in HP EliteBook 8540w system - Online PC Support
595764-001 Motherboard For Hp Elitebook 8540p 8540w La-4951p - Laptop Motherboard - AliExpress
HP EliteBook 8540p (Intel(R) Core(TM) i7 CPU M 640 @ 2.80GHz, 6GB RAM, 320GB HDD) with Windows 10 Professional & Microsoft Office 2010 Home and Business