How much RAM can I install in the HP ProBook 4540s, and what type does it support?
The HP ProBook 4540s supports up to 8 GB of RAM across two customer-accessible and upgradeable memory module slots. It uses PC3-10600, 1333-MHz, DDR3 memory and supports dual-channel memory configurations. Supported configurations include 8192 MB (4096 x 2), 6144 MB (4096 + 2048), 4096 MB, and 2048 MB. (Page 2)
From the official HP Probook 4540s Notebook PC manual, page 2
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