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Dynabook Portege X40-J (2021) Specifications
The Dynabook Portege X40-J (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 Dynabook upgradeable models, visit the Dynabook Laptop Upgrades hub.
| Component | Specification |
|---|---|
| Processor | i7-1165G7 |
| RAM | DDR4-3200, on-board + 1 SO-DIMM slot |
| Max RAM | 32GB |
| Storage | M.2 2280 NVMe PCIe Gen3, 1 slot |
| Charger | 65W USB-C |
| Ports | 2x USB-C, 2x USB 3.2, 1x HDMI |
| Display | 14.0″ FHD IPS |
| Weight | 1.05 kg (2.32 lbs) |
Memory Upgrade Path
The Portege X40-J has DDR4-3200 RAM (on-board plus one SO-DIMM slot) (32GB maximum); the SO-DIMM slot can be upgraded.
Important: Since part of the RAM is on-board, we recommend opting for at least 16GB at purchase to ensure adequate performance for years to come.
Storage Expansion
The Portege X40-J uses an M.2 2280 NVMe SSD with a NVMe PCIe Gen3 interface. The single M.2 slot supports drives up to 2TB.
M.2 2230 SSDs (shorter than the X40-J M.2 2280 slot):
- WD SN740 2230 NVMe — Reliable compact SSD for the 2230 form factor.
- Samsung PM991a 2230 — High-performance OEM SSD in compact 2230 size.
- Kioxia BG5 2230 — Compact 2230 NVMe with good availability.
Note: the X40-J uses a standard M.2 2280 SSD. Verify compatibility before purchasing.
Power Delivery & Charging
The Portege X40-J 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 Dynabook 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: 2x USB-C, 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 Portege X40-J has a difficulty rating of 2/5 for upgrades (5 = easiest). The upgrade process is difficult — limited user-accessible components.
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 Dynabook Portege X40-J?
The Portege X40-J has DDR4-3200 on-board RAM plus one SO-DIMM slot, up to 32GB total, and the SO-DIMM slot can be upgraded.
What is the maximum RAM for the Portege X40-J?
The Portege X40-J supports up to 32GB of DDR4-3200 memory.
What size SSD does the Portege X40-J use?
The Portege X40-J uses an M.2 2280 NVMe SSD. Make sure to purchase the correct form factor for compatibility.
Can I use any USB-C charger with the Portege X40-J?
Yes, any USB-C Power Delivery charger rated for 65W or higher will work with the Portege X40-J.
Is the Portege X40-J easy to upgrade?
The Portege X40-J has a difficulty rating of 2/5. Consider professional assistance for upgrades.
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 |
|---|---|---|
| WD SN740 2230 NVMe | Reliable compact SSD for the 2230 form factor. | View on Amazon |
| Samsung PM991a 2230 | High-performance OEM SSD in compact 2230 size. | View on Amazon |
| Kioxia BG5 2230 | Compact 2230 NVMe with good availability. | 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 Guides
Upgrades that fit the Dynabook Portege X40-J
What fits: Memory: DDR4-3200 SO-DIMM, 1 user slot, up to 32GB · Storage: M.2 2280 NVMe PCIe (gen unverified) · Charger: USB-C PD 65W
Spec source: asia.dynabook.com (checked 26 Sep 2026).
As an Amazon Associate we earn from qualifying purchases. Prices & availability shown on Amazon.
