The Samsung Galaxy Book4 Ultra features Intel Core Ultra 9 185H, 16″ 3K AMOLED 120Hz display, and soldered LPDDR5X memory (32GB maximum). While RAM cannot be upgraded after purchase, the SSD is user-replaceable, making it the primary upgrade path. This guide covers complete Samsung Galaxy Book4 Ultra compatibility for upgrades.
RAM Compatibility for Samsung Galaxy Book4 Ultra
The Samsung Galaxy Book4 Ultra uses soldered LPDDR5X memory that cannot be upgraded after purchase. You must choose your RAM configuration at the time of ordering.
Memory Type: LPDDR5X (soldered to motherboard)
Stock Configuration: 16GB or 32GB
Maximum Capacity: 32GB
Upgradeable: No — RAM is permanently soldered
| Configuration | Memory | Total | Best For |
|---|---|---|---|
| Base config | 16GB LPDDR5X | 16GB | Productivity, moderate multitasking |
| Upgraded config | 32GB LPDDR5X | 32GB | Professional workflows, heavy multitasking |
Since RAM is soldered, choosing the right amount at purchase is critical. For general productivity and web browsing, 16GB is adequate. For professional use, video editing, or running virtual machines, configure with the maximum available. There is no way to upgrade later, so err on the side of more RAM if your budget allows.
SSD & Storage Upgrades
The Samsung Galaxy Book4 Ultra includes a single M.2 slot for SSD storage. The M.2 2280 PCIe Gen 4 NVMe interface provides fast read/write speeds.
Stock Configuration: 1TB
Maximum Capacity: 2TB
Interface: M.2 2280, NVMe over PCIe Gen 4
Slots: 1
| Upgrade Option | Replacement SSD | Total Storage | Best For |
|---|---|---|---|
| Keep factory | 1TB (keep) | 1TB | Light use, basic storage needs |
| Recommended upgrade | 1TB replacement | 1TB | Most users, good balance of space and cost |
| Premium upgrade | 2TB replacement | 2TB | Large file collections, creative professionals |
For the best performance, the Samsung 990 Pro and WD Black SN850X are top picks for PCIe Gen 4 drives. To upgrade: power down, remove bottom panel, locate the M.2 slot, remove the retaining screw, slide out the old drive, insert the new one at 30 degrees, and secure with the screw.
Charger & Power Compatibility
The Samsung Galaxy Book4 Ultra ships with a 100W USB-C PD. USB-C Power Delivery is supported, allowing use of third-party USB-C chargers.
Stock Charger: 100W USB-C PD
USB-C Power Delivery: Yes
| Charger Option | Wattage/Type | Charging Speed | Notes |
|---|---|---|---|
| Stock charger | 100W USB-C PD | Full speed charging | Included with laptop |
| Third-party USB-C PD | 100W+ USB-C PD GaN | Full speed (match wattage) | Compact travel alternative |
| Lower wattage USB-C | 45-65W USB-C PD | Slow charge, may not sustain under load | Emergency/travel only |
For the best portable charging experience, a GaN USB-C PD charger matching or exceeding the stock wattage is recommended. This lets you leave the original charger at your desk and carry a compact GaN adapter for travel.
Buy Compatible Charger on Amazon UK
Dock & Hub Compatibility
The Samsung Galaxy Book4 Ultra supports Thunderbolt, enabling full-bandwidth docking solutions.
Thunderbolt Support: Yes
USB-C Power Delivery: Yes
Recommended Dock Type: Thunderbolt dock for full desktop replacement
| Dock Type | Connection | Use Case | Notes |
|---|---|---|---|
| Thunderbolt dock | Thunderbolt 4/5 | Full desktop replacement | Up to 40Gbps, dual 4K displays, charging |
| USB-C dock | USB-C 3.2 | Basic desktop setup | Single display, peripherals, charging |
| USB-C hub | USB-C multiport | Portable expansion | HDMI + USB-A + card reader for travel |
A Thunderbolt dock like the CalDigit TS4 or Anker 777 provides the best desktop experience — dual 4K displays, fast data transfer, and single-cable charging.
Buy Compatible Dock on Amazon UK
Samsung Galaxy Book4 Ultra Full Specifications
| Component | Specification |
|---|---|
| Processor | Intel Core Ultra 9 185H |
| Display | 16″ 3K AMOLED 120Hz |
| RAM | LPDDR5X (max 32GB) — soldered |
| Storage | M.2 2280 PCIe Gen 4 NVMe |
| Thunderbolt | Yes |
| USB-C PD Charging | Yes |
| Charger | 100W USB-C PD |
| Weight | 1.86kg |
Frequently Asked Questions
Can I upgrade the RAM in the Samsung Galaxy Book4 Ultra?
No. The Samsung Galaxy Book4 Ultra uses soldered memory that cannot be upgraded after purchase. You must choose your RAM configuration at the time of ordering. We recommend selecting the highest amount your budget allows.
Can I upgrade the SSD in the Samsung Galaxy Book4 Ultra?
Yes. The SSD uses a standard M.2 slot and can be replaced with a compatible NVMe drive.
Does the Samsung Galaxy Book4 Ultra support USB-C charging?
Yes. You can charge via any USB-C Power Delivery charger. Match or exceed the stock wattage for full-speed charging.
Is the Samsung Galaxy Book4 Ultra still worth buying in 2026?
For its price point, the Samsung Galaxy Book4 Ultra remains competitive. While RAM is soldered, the SSD can be upgraded for more storage.
What accessories are compatible with the Samsung Galaxy Book4 Ultra?
Thunderbolt docks (CalDigit TS4, Anker 777), USB-C hubs, external monitors (up to 4K/6K), and USB-C PD chargers.
Recommended Products
These are the products we recommend based on this guide. All links go to Amazon UK where you can check current prices and availability.
| Product | Why We Recommend It | Amazon UK |
|---|---|---|
| Samsung 990 Pro 2TB NVMe M.2 2280 | Fastest consumer NVMe | View on Amazon UK |
| WD Black SN850X 1TB NVMe | Excellent Gen4 performance | View on Amazon UK |
| Anker 737 GaN 120W USB-C Charger | Compact high-power GaN charger | View on Amazon UK |
Prices and availability may vary. As an Amazon Associate, we earn from qualifying purchases.
