These three desktop lines dominate corporate IT. Whether you’re equipping an office or buying a refurbished machine, understanding the differences helps you make the right choice.
Form Factor Options
| Form Factor | Dell OptiPlex | HP EliteDesk/ProDesk | Lenovo ThinkCentre |
|---|---|---|---|
| Tower | OptiPlex Tower | EliteDesk/ProDesk Tower | ThinkCentre Tower |
| Small Form Factor | OptiPlex SFF | EliteDesk/ProDesk SFF | ThinkCentre SFF |
| Mini/Micro | OptiPlex Micro | EliteDesk Mini/ProDesk Mini | ThinkCentre Tiny |
| Ultra-Small | OptiPlex Ultra | N/A | ThinkCentre Nano |
Upgradeability
All three brands offer excellent upgradeability in Tower and SFF form factors — 4 DIMM slots, multiple storage bays, and PCIe expansion. Mini/Micro models are more limited with 1-2 SO-DIMM slots and M.2 storage only. Dell OptiPlex Micro stands out with a modular design that supports optional GPU or additional storage modules.
Value — New vs Refurbished
New corporate desktops cost £500-1000. Refurbished units from 1-3 years ago offer exceptional value at £150-300 — often with an i5 processor, 8-16GB RAM, and SSD. All three brands are readily available refurbished. Upgrading a refurbished unit with more RAM and an SSD creates a highly capable machine for under £250.
Our Verdict
For new purchases, all three are equally excellent — let your reseller pricing decide. For refurbished, Dell OptiPlex has the widest availability and aftermarket part ecosystem. All three accept standard components (DDR4/DDR5 DIMMs, M.2 NVMe SSDs) making upgrades straightforward.
Frequently Asked Questions
Which business desktop is easiest to upgrade?
Dell OptiPlex and Lenovo ThinkCentre feature the most tool-less designs. HP requires slightly more effort to access components.
Are refurbished business desktops worth buying?
Yes. Refurbished Dell OptiPlex, HP EliteDesk, and Lenovo ThinkCentre units offer excellent value at £150-300.
Recommended Desktop Upgrades (RAM & SSD)
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How we verify this guide
We cross-reference compatibility figures against manufacturer specifications where available, 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 →
