Comparison of PCIe Gen 4 and Gen 5 NVMe SSDs. Speed differences, compatibility, pricing.
Key Takeaways
- Always check compatibility before purchasing any upgrade. Use our model-specific guides for verified specifications.
- DDR4 and DDR5 are not interchangeable – verify which generation your device supports.
- Form factor matters – laptops use SO-DIMM, desktops use DIMM, NAS devices typically use SO-DIMM.
- Maximum capacity limits vary by device – exceeding them causes boot failures or wasted money.
Practical Recommendations
Based on testing across hundreds of devices:
- Office work: 16GB RAM + 500GB SSD
- Gaming: 32GB RAM + 1TB NVMe SSD
- Content creation: 32-64GB RAM + 2TB NVMe SSD
- Servers: 64-128GB ECC RAM + enterprise NVMe
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Related Guides
FAQ
How do I check compatibility?
Use our model-specific guides or check the manufacturer QVL. Always verify DDR generation, form factor, and max capacity.
Where to buy upgrades in the UK?
We recommend Amazon UK for best pricing, selection, and returns.
Will upgrading void my warranty?
Most manufacturers consider RAM/SSD upgrades user-serviceable. Check your specific warranty terms.
Updated April 2026.
Making Your Decision
The right choice depends on your specific use case, budget, and system compatibility. If your system only supports one option, the decision is made for you. If you have a choice, consider what matters most: raw performance, value for money, or future-proofing.
For most users upgrading in 2026, we recommend going with the newer standard if your budget allows and your system supports it. The performance improvements compound over time, and you’ll benefit from broader compatibility with future software.
Find Compatible Upgrades
Use our guides and tools to find the right parts for your system.
RAM Guide SSD GuideRelated Guides
Recommended NVMe SSDs
Western Digital
Western Digital WD SSD M.2 (2280) 4TB Black SN8100 PCIe 5.0/NVMe (Di)
£1,152.20
View Deal
How we verify this guide
Every compatibility figure here is checked against manufacturer specifications, official service manuals, and the standards that govern fit — memory type and speed (DDR4 / DDR5 / LPDDR5), maximum supported capacity and slot count, SSD form factor and interface (M.2 2280, NVMe PCIe vs SATA, keying), and charger wattage and connector (USB-C Power Delivery, GaN). We’re explicit about soldered or non-upgradeable parts, prioritise primary sources over retailer listings, and re-verify the data on a regular cycle. More on our method →
