Both the ThinkPad T14 and HP EliteBook 840 are premium business laptops, and both offer some upgrade potential — but they differ significantly in RAM capacity, SSD configuration, and port connectivity. If you’re planning to buy one for the long term and want expansion options, understanding these differences is critical.
This guide compares RAM, SSD, charger, and dock compatibility so you can decide which laptop will better serve your workflow as you upgrade over time.
Quick Verdict Table
| Upgrade Path | ThinkPad T14 | EliteBook 840 |
|---|---|---|
| RAM Upgrade | 2x DDR5 SO-DIMM (up to 96GB) | 2x DDR5 SO-DIMM (up to 64GB) |
| SSD Options | 1x M.2 2280 + optional 2nd M.2 | 2x M.2 2280 (standard) |
| Charger Compatibility | USB-C 65W / 90W standard | Proprietary 65W or USB-C variant |
| Dock Support | Optional Thunderbolt dock | Optional USB-C dock (check variant) |
| Best For | Maximum RAM, enterprise support | Dual SSD flexibility |
RAM Upgrade Comparison
Both laptops use DDR5 SO-DIMM memory modules, meaning you can upgrade the RAM yourself after purchase. However, capacity limits differ.
The ThinkPad T14 accepts up to 96GB total (2x 48GB modules), though stock configurations typically max out at 32GB. The EliteBook 840 supports up to 64GB (2x 32GB modules), which is still substantial for business workloads.
If you’re running virtual machines, data analysis, or demanding multitasking, the ThinkPad’s 96GB ceiling gives you a longer upgrade path. For typical office work, both are more than sufficient. DDR5 SO-DIMM modules cost between £60–£150 per module depending on capacity.
SSD Upgrade Comparison
Storage is where these two diverge noticeably.
The EliteBook 840 includes two M.2 2280 SSD slots as standard, giving you dual-storage flexibility out of the box. You can run a fast NVMe drive for your OS and a second drive for work files or backups.
The ThinkPad T14 typically ships with one M.2 2280 slot, though some configurations may include an optional second slot. Check your specific model — this varies by generation and SKU. If only one slot is available, you’re limited to a single upgrade path unless your model supports a secondary M.2 slot.
Both accept standard NVMe SSDs (Samsung 990 Pro, WD Black SN850X, Crucial P5 Plus, etc.). Upgrading from 512GB to 2TB costs approximately £100–£200.
Charger & Power Compatibility
Charger compatibility is often overlooked but important if you’re carrying multiple devices or sharing chargers across your office.
The ThinkPad T14 uses a standard USB-C power connector (typically 65W or 90W). This means any compatible USB-C PD charger (laptop or tablet level) can charge it, and you can use it with existing USB-C chargers you may own.
The EliteBook 840 varies by model year. Older variants use HP’s proprietary 65W connector. Newer models offer USB-C charging, but confirm your specific SKU with HP before assuming compatibility.
For long-term flexibility, the ThinkPad’s USB-C standard is a major advantage — you’re not locked into proprietary chargers if the original fails.
Dock & Connectivity
Both laptops support external docking for office setups.
The ThinkPad T14 works with optional Thunderbolt docks, which offer the fastest bandwidth for multi-monitor setups and external storage. Thunderbolt docks cost £150–£300 but are robust for power users.
The EliteBook 840 supports standard USB-C docking. Some newer variants include Thunderbolt, but most standard EliteBook configurations use USB-C docks, which are typically cheaper (£80–£150) but slightly slower for data transfer.
Both laptop families support dual external monitors via dock, so if you’re docking in an office, either will work. Check which dock type your specific variant supports.
Which Should You Choose?
Choose the ThinkPad T14 if: You want maximum RAM capacity for memory-heavy workloads, you prefer USB-C charging for ecosystem flexibility, or you need Thunderbolt connectivity for high-speed data work. Enterprise support and parts availability are also stronger for ThinkPads in UK businesses.
Choose the EliteBook 840 if: You value dual SSD slots out of the box and want to run multiple storage drives immediately. If your organisation uses HP devices standardly, EliteBook support and spare parts may also be easier to source.
Full Specifications Comparison
| Specification | ThinkPad T14 | EliteBook 840 |
|---|---|---|
| Processor | Intel Core Ultra (Gen 1/2) | Intel Core Ultra (Gen 1/2) |
| RAM (Stock) | 16GB or 32GB DDR5 SO-DIMM | 16GB or 32GB DDR5 SO-DIMM |
| Max RAM | 96GB (2x 48GB) | 64GB (2x 32GB) |
| Storage (Stock) | 512GB or 1TB M.2 NVMe | 512GB or 1TB M.2 NVMe |
| SSD Slots | 1–2 (model dependent) | 2 (standard) |
| Display | 14″ IPS (1920×1200 or 2560×1600) | 14″ IPS (1920×1200 or 2560×1440) |
| Charger | USB-C 65W/90W | Proprietary 65W or USB-C (variant) |
| Ports | 2x USB-C (Thunderbolt 4), 2x USB-A, HDMI 2.1, SD card | 2x USB-C, 2x USB-A, HDMI 2.1, SD card |
| Docking | Thunderbolt dock optional | USB-C dock optional |
| Weight | 1.39 kg (14″) | 1.34 kg (14″) |
| Battery | 52–63Wh | 52–66Wh |
Frequently Asked Questions
Can I upgrade RAM in both laptops?
Yes. Both use standard DDR5 SO-DIMM modules, so you can swap them yourself without special tools. ThinkPads are slightly easier to access, requiring a single bottom-panel removal. EliteBooks also access RAM via the bottom panel.
Which laptop offers better storage upgrade potential?
The EliteBook 840 offers dual M.2 2280 slots as standard, while the ThinkPad T14 may have only one (though some configurations support a second). If you need multiple drives, the EliteBook wins here. Both accept standard NVMe modules.
Are ThinkPad and EliteBook chargers compatible?
Not typically. ThinkPads use USB-C Power Delivery, while EliteBooks may use proprietary connectors (on older models). Check your specific variant before assuming interchangeability. USB-C models may work with compatible USB-C PD chargers.
What’s the warranty coverage for upgrades?
Both manufacturers allow user RAM and SSD upgrades without voiding warranty, provided you don’t damage components during installation. Keep upgrade receipts in case of future claims.
Can I use external docks with both?
Yes, both support docking via USB-C. ThinkPads also support Thunderbolt docks for higher bandwidth. Dock availability and compatibility vary by model year — confirm your specific variant with the dock manufacturer.
Which is better for future-proofing?
The ThinkPad T14 offers a longer RAM upgrade path (96GB vs 64GB), USB-C charging standardisation, and Thunderbolt support. However, the EliteBook’s dual SSD slots provide immediate expansion flexibility. For most users, the ThinkPad edges ahead for long-term expandability.
Where to Buy
Looking for compatible components? Check current prices and availability:
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 |
|---|---|---|
| Corsair Vengeance DDR5 SO-DIMM 32GB (2×16GB) 5600MHz | Top-rated DDR5 kit for gaming & productivity | View on Amazon UK |
| Kingston Fury Impact DDR5 SO-DIMM 32GB (2×16GB) 5600MHz | Excellent DDR5 alternative with XMP support | View on Amazon UK |
| Crucial DDR5 SO-DIMM 16GB 5600MHz | Affordable single-stick DDR5 | View on Amazon UK |
| G.Skill Ripjaws DDR5 SO-DIMM 32GB 5600MHz | High performance DDR5 for enthusiasts | View on Amazon UK |
| Samsung 990 Pro 2TB NVMe M.2 2280 | Fastest consumer NVMe — ideal for gaming & editing | View on Amazon UK |
| WD Black SN850X 2TB NVMe | Excellent Gen4 speed with heatsink option | View on Amazon UK |
| Crucial P5 Plus 1TB NVMe | Great value Gen4 SSD | View on Amazon UK |
| Kingston NV2 1TB NVMe | Budget-friendly with solid reliability | View on Amazon UK |
Prices and availability may vary. As an Amazon Associate, we earn from qualifying purchases.
