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Introduction

The ThinkPad P51s includes two DDR4 SO-DIMM RAM slots, allowing the memory to be upgraded or replaced as performance needs change. Over time, faulty or improperly seated RAM can cause symptoms such as random shutdowns, failure to boot, continuous beeping on startup, freezes under load, or the laptop not detecting the full installed memory. Users often upgrade the RAM to improve multitasking, workstation workloads, or virtualization performance.

Before beginning this repair, shut down the laptop completely and disconnect it from the AC adapter. Lenovo recommends removing the external battery first to prevent power from reaching the motherboard. Handle RAM modules only by the edges and avoid touching the gold contacts to prevent electrostatic damage. Mixing memory of different speeds or capacities can also reduce performance or prevent the system from posting, so confirm compatibility before installation.

This guide will walk you through safely accessing and replacing the RAM modules using standard tools. Take your time when removing the bottom cover.

What you need

Step 1 RAM

Lenovo ThinkPad P51s RAM Replacement, RAM: step 1, image 1 of 2

Lenovo ThinkPad P51s RAM Replacement, RAM: step 1, image 2 of 2

Flip the laptop so the bottom is facing up.
Place it on a soft cloth so you don’t scratch the lid.

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Step 2

Lenovo ThinkPad P51s RAM Replacement: step 2, image 3 of 3

Slide both locking latches outward using your thumbs.
Keep the right latch held in the unlocked position with your right thumb. With your left hand, pushed the battery out of its placement from the slot.
Once it detaches, use both hands to slide the battery out.

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Step 3

Use a Phillips #00 screwdriver to loosen all seven captive screws that secure the lower case.
Do not try to remove the captive screws. They should remain in the bottom case.

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Step 4

Lenovo ThinkPad P51s RAM Replacement: step 4, image 3 of 3

Insert an iFixit opening tool into the gap along one edge of the laptop.
Gently slide it around the perimeter to release the clips.
Work slowly and avoid twisting the tool to prevent cracking the cover or bending the frame.
Lift the bottom cover off once all clips are released.
Metal tools can crack the plastic clips—use only plastic prying tools.