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Dynabook Portege X40L-K (2023) Specifications
The Dynabook Portege X40L-K (2023) 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 | i5-1340P / i5-1350P vPro / i7-1360P / i7-1370P vPro |
| RAM | On-board LPDDR5-4800, soldered (0 slots) |
| Max RAM | 32GB — fixed at purchase, cannot be upgraded |
| Storage | M.2 2280 NVMe PCIe Gen4, 1 slot |
| Charger | 65W USB-C |
| Ports | 1x USB-C 3.2, 2x USB 3.2, 1x HDMI, 1x RJ45 |
| Display | 14.0″ WUXGA IPS |
| Weight | 0.97 kg (2.14 lbs) |
Memory Upgrade Path
The Dynabook Portege X40L-K has no memory slots — its memory is soldered to the board, fixed at 32GB. Both slots are user-accessible, and the upgrade process is straightforward.
Storage Expansion
The Dynabook Portege X40L-K uses a standard M.2 2280 NVMe SSD with a NVMe PCIe Gen4 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 Dynabook Portege X40L-K 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: 1x USB-C 3.2, 2x USB 3.2, 1x HDMI, 1x RJ45
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 Dynabook Portege X40L-K has a difficulty rating of 3/5 for upgrades (5 = easiest). The upgrade process is moderate — requires careful handling of bottom panel clips.
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 X40L-K?
No. The Portégé X40L-K has its memory soldered to the system board with no SO-DIMM slot. Choose the capacity you need at the point of purchase.
What is the maximum RAM for the Dynabook Portege X40L-K?
32GB, soldered and fixed when the machine is built.
Can I add a second SSD to the Dynabook Portege X40L-K?
The Dynabook Portege X40L-K has 1 M.2 slot. You can replace the existing SSD with a larger drive.
Can I use any USB-C charger with the Dynabook Portege X40L-K?
Yes, any USB-C Power Delivery charger rated for 65W or higher will work with the Dynabook Portege X40L-K.
Is the Dynabook Portege X40L-K easy to upgrade?
The Dynabook Portege X40L-K has a difficulty rating of 3/5. Some care needed with bottom panel clips.
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 |
|---|---|---|
| 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 Guides
Upgrades that fit the Dynabook Portege X40L-K
What fits: Memory: LPDDR5 soldered to the board — not upgradeable · Storage: M.2 2280 NVMe PCIe 4.0 · Charger: USB-C PD 65W
Spec source: anz.dynabook.com (checked 26 Sep 2026).
As an Amazon Associate we earn from qualifying purchases. Prices & availability shown on Amazon.
M.2 2280 NVMe SSDs that fit
USB-C charger (65W)
Correction note: this page previously described the X40L-K as having two DDR5 SO-DIMM slots and listed U-series processors. Neither is right — Dynabook builds it with on-board LPDDR5-4800 and no memory slots, and it ships P-series processors. The slotted model in this family is the Portégé X40-M.
