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Introduction

The HP Probook 640 G4 is a business class 14 inch laptop that is designed for durability. This guide will walk you through how to safely replace the RAM. A failing RAM can cause random freezes and "out of memory" errors.

Before you start be sure to power the laptop off completely, unplug the AC adapter, and remove all external devices. Work on a clean flat surface. Make sure you have all of the right tools and parts available.

If your Probook is slow with many browser tabs, shows "low memory" warnings, or crashes often, replacing the RAM often helps. After replacement, be sure to run Windows Memory Diagnostic to verify that your replacements are recognized.

What you need

Step 1 Lower Case

HP ProBook 640 G4 RAM Replacement, Lower Case: step 1, image 1 of 2

HP ProBook 640 G4 RAM Replacement, Lower Case: step 1, image 2 of 2

Loosen the eight 2.5 mm-long Phillips captive screws securing the lower case.
Captive screws cannot be fully removed.

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Step 2

Insert an opening pick into the seam between the lower case and chassis, and twist it to create a gap.
Insert an opening tool into the gap.
Use the opening tool to pry around the entire perimeter of the device until the lower case fully releases.
Remove the lower case.

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Step 3 Battery

HP ProBook 640 G4 RAM Replacement, Battery: step 3, image 1 of 3

HP ProBook 640 G4 RAM Replacement, Battery: step 3, image 2 of 3

HP ProBook 640 G4 RAM Replacement, Battery: step 3, image 3 of 3

Use a Phillips screwdriver to loosen the six 2.5 mm-long captive screws securing the battery.
Captive screws are not fully removable—they only loosen.
Slide and lift the battery out.

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Step 4 RAM

HP ProBook 640 G4 RAM Replacement, RAM: step 4, image 1 of 3

HP ProBook 640 G4 RAM Replacement, RAM: step 4, image 2 of 3

HP ProBook 640 G4 RAM Replacement, RAM: step 4, image 3 of 3

Two clips secure each RAM module in place, one on each side. Using your fingers, spread the clips away from the RAM module.
Repeat for the other RAM module.
Remove each of the two RAM modules.

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Conclusion

To reassemble your device, follow the above steps in reverse order.
Take your e-waste to an R2 or e-Stewards certified recycler.
Repair didn’t go as planned? Try some basic troubleshooting or ask our Answers community for help.