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Lenovo ThinkBook 15 Gen 3 (AMD) (2021) Specifications
The Lenovo ThinkBook 15 Gen 3 (AMD) (2021) is a professional-grade business laptop for enterprise users. This guide covers RAM, SSD, charger compatibility, and upgrade paths for this model. For a comprehensive overview of all Lenovo upgradeable models, visit the Lenovo Laptop Upgrades hub.
| Component | Specification |
|---|---|
| Processor | Ryzen 5 5600U / Ryzen 7 5800U |
| RAM | 1 × soldered + 1 × DDR4-3200 SO-DIMM slot |
| Max RAM | 36GB (4+32) or 40GB (8+32), depending on the soldered amount |
| Storage | Up to two drives — 2 × M.2, or M.2 plus a 2.5″ bay |
| Charger | 65W USB-C |
| Ports | 1x USB-C 3.2, 2x USB 3.2, 1x HDMI |
| Display | 15.6″ FHD IPS |
| Weight | 1.7 kg (3.75 lbs) |
Memory Upgrade Path
The Lenovo ThinkBook 15 Gen 3 (AMD) has one soldered memory bank plus a single DDR4-3200 SO-DIMM slot, allowing upgrades up to 32GB. Both slots are user-accessible, and the upgrade process is straightforward.
Recommended DDR4 RAM Upgrades:
- Corsair Vengeance DDR4 SO-DIMM — Reliable DDR4 laptop memory with wide compatibility.
- Kingston Fury Impact DDR4 SO-DIMM — Compact high-performance DDR4 for laptops.
- Crucial DDR4 SO-DIMM — Affordable DDR4 with solid performance.
Storage Expansion
The Lenovo ThinkBook 15 Gen 3 (AMD) uses a standard M.2 2280 NVMe SSD with a NVMe PCIe Gen3 interface. The single M.2 slot supports drives up to 2TB.
Recommended M.2 2280 SSDs:
- Samsung 990 Pro NVMe 2280 — Flagship NVMe SSD with exceptional speeds.
- WD Black SN850X 2280 — High-performance NVMe with excellent sustained writes.
- Crucial P5 Plus NVMe 2280 — Excellent value NVMe with strong real-world performance.
Power Delivery & Charging
The Lenovo ThinkBook 15 Gen 3 (AMD) uses a 65W USB-C charger. This is compatible with any USB-C PD charger of equal or higher wattage from brands like Anker, Ugreen, or the original Lenovo charger.
Compatible USB-C PD Chargers:
- Anker 65W USB-C PD Charger — Compact GaN charger with multiple ports.
- Ugreen USB-C PD Charger (65W+) — Affordable universal charger with fast charging.
- INIU USB-C PD Fast Charger — Budget option with reliable performance.
Port & Docking Capabilities
Connectivity: 1x USB-C 3.2, 2x USB 3.2, 1x HDMI
A USB-C docking station like the Anker 577 USB-C Hub provides additional ports including HDMI, Ethernet, and USB-A.
Upgrade Difficulty & Tools Required
The Lenovo ThinkBook 15 Gen 3 (AMD) has a difficulty rating of 4/5 for upgrades (5 = easiest). The upgrade process is straightforward — standard screws and easy component access.
Tools needed:
- Phillips screwdriver (M2.5 or similar)
- Plastic spudger or pry tool (for bottom panel clips)
- ESD wrist strap (optional but recommended)
We recommend backing up your data and consulting the official service manual before opening the chassis.
Frequently Asked Questions
Can I upgrade the RAM in the Lenovo ThinkBook 15 Gen 3 (AMD)?
Partly. The ThinkBook 15 Gen 3 (AMD) has memory soldered to the board plus one free SO-DIMM slot, so you can add a module but not replace what is soldered. The ceiling is 36GB or 40GB depending on the soldered amount.
What is the maximum RAM for the Lenovo ThinkBook 15 Gen 3 (AMD)?
36GB (4GB soldered + 32GB module) or 40GB (8GB soldered + 32GB module).
Can I add a second SSD to the Lenovo ThinkBook 15 Gen 3 (AMD)?
The Lenovo ThinkBook 15 Gen 3 (AMD) has 1 M.2 slot. You can replace the existing SSD with a larger drive.
Can I use any USB-C charger with the Lenovo ThinkBook 15 Gen 3 (AMD)?
Yes, any USB-C Power Delivery charger rated for 65W or higher will work with the Lenovo ThinkBook 15 Gen 3 (AMD).
Is the Lenovo ThinkBook 15 Gen 3 (AMD) easy to upgrade?
The Lenovo ThinkBook 15 Gen 3 (AMD) has a difficulty rating of 4/5. Standard screws and clear access to components.
Recommended Products
These are the products we recommend based on this guide. All links go to Amazon where you can check current prices and availability.
| Product | Why We Recommend It | Amazon |
|---|---|---|
| Corsair Vengeance DDR4 SO-DIMM | Reliable DDR4 laptop memory with wide compatibility. | View on Amazon |
| Kingston Fury Impact DDR4 SO-DIMM | Compact high-performance DDR4 for laptops. | View on Amazon |
| Crucial DDR4 SO-DIMM | Affordable DDR4 with solid performance. | View on Amazon |
| Samsung 990 Pro NVMe 2280 | Flagship NVMe SSD with exceptional speeds. | View on Amazon |
| WD Black SN850X 2280 | High-performance NVMe with excellent sustained writes. | View on Amazon |
| Crucial P5 Plus NVMe 2280 | Excellent value NVMe with strong real-world performance. | View on Amazon |
| Anker 65W USB-C PD Charger | Compact GaN charger for USB-C laptops. | View on Amazon |
| Ugreen 65W USB-C PD Charger | Affordable universal USB-C charger. | View on Amazon |
Prices and availability may vary. As an Amazon Associate, we earn from qualifying purchases.
Related Lenovo Upgrade Guides
- Lenovo Battery Replacement: ThinkPad, IdeaPad & Legion Step-by-Step
- Best RAM for Lenovo ThinkPad in 2026
- Lenovo ThinkSystem SR665 V3 RAM & SSD Upgrade Guide (2023)
- Lenovo ThinkSystem SR665 RAM & SSD Upgrade Guide (2020)
- Lenovo ThinkSystem SR645 RAM & SSD Upgrade Guide (2020)
- Lenovo Upgrade Guide
Not sure what fits? Use our free Compatibility Checker covering 3,195+ models.
Helpful Guides
Upgrades that fit the Lenovo ThinkBook 15 G3 ACL
What fits: Memory: DDR4-3200 SO-DIMM, 1 user slot, up to 40GB · Storage: 2x M.2 2280 NVMe PCIe 3.0 · Charger: USB-C PD 65W
Spec source: psref.lenovo.com (checked 26 Sep 2026).
As an Amazon Associate we earn from qualifying purchases. Prices & availability shown on Amazon.
