Buying desktops and mini PCs in bulk for offices and schools

Tower, small form factor or mini PC

Business desktops come in three main sizes, and each suits a different room. A tower, labelled MT, TWR or Tower depending on the maker, has the most room inside: space for full-height expansion cards, several drives and a larger power supply. It suits a workstation, an IT bench or anywhere a graphics card might be added later. It also takes the most space on or under the desk.

A small form factor (SFF) desktop is the office standard. It is a fraction of the size, still has an internal power supply, and usually takes low-profile cards and one or two drives. It sits on a desk or under a monitor stand and is easy to service.

Mini PCs, sold as Dell OptiPlex Micro, HP EliteDesk and ProDesk Mini, and Lenovo ThinkCentre Tiny, are about the size of a hardback book. They run from an external power adapter, can be fixed to the back of a monitor with a VESA bracket and draw little power. They suit reception desks, classrooms and anywhere space or noise matters. The trade-off is expansion: a mini PC usually has two memory slots, one or two drive slots and no room for a graphics card.

One model per site

For an office or a school, the best single decision is to standardise. If every machine in a building is the same model, IT staff build one Windows image, keep one set of drivers, stock one kind of spare and learn one set of quirks. Mixed lots can look cheaper per unit, but the time spent supporting five different models soon outweighs the saving.

When a lot mixes generations of one model line, such as an OptiPlex 7060 and 7070, treat each generation as a separate model for imaging. Buy a few more units than you need, roughly one spare for every twenty machines, so a failure can be swapped in minutes and the faulty unit dealt with later.

The specification that matters

Windows 11 is now the baseline for most organisations, since support for Windows 10 ended in October 2025. That means an Intel 8th Gen or AMD Ryzen 2000 series processor or newer, with TPM 2.0 and Secure Boot. Business desktops from 2018 onwards generally meet the requirements, though TPM and Secure Boot sometimes need enabling in the firmware settings.

For memory, 8GB runs Windows 11 and office software; 16GB is the comfortable figure for staff who keep a browser full of tabs, video calls and spreadsheets open at once. Storage should be a solid-state drive in every case. A machine with a mechanical hard drive feels slow whatever its processor, and an SSD is the cheapest upgrade that changes how a computer feels to use.

Check what each size takes before you order upgrades. Towers and SFF desktops use full-size desktop memory (DIMM). Mini PCs use the smaller laptop memory (SODIMM), the same modules as most laptops. Most business desktops from the 8th Gen on have an M.2 slot for an NVMe SSD, and towers and SFFs add 2.5-inch or 3.5-inch SATA bays.

Power, screens and cables

Towers and SFF desktops take a standard IEC mains lead, the C13 connector also used by many monitors. Mini PCs run from an external adapter much like a laptop charger, often with the same connector the maker uses on its laptops, and the adapter itself takes a smaller clover-leaf (C5) or figure-of-eight (C7) lead. Many lots ship without adapters or leads, so check the sheet and price them in.

Look at the video outputs before choosing monitors. Business desktops of this era usually have two DisplayPort outputs, often with an HDMI or VGA port as well, while older monitors may have only VGA or DVI. A DisplayPort to HDMI cable or adapter solves most mismatches, but counting them before delivery saves a second order. If staff need two screens, confirm the model has two usable digital outputs.

Networking and Wi-Fi

Do not assume a business desktop has Wi-Fi. Many towers and SFFs were bought for wired offices and have only an Ethernet port. Mini PCs more often include Wi-Fi, but some were ordered without the card or its antennas. If a room has no network sockets, check the spreadsheet for a Wi-Fi column, or plan for USB or PCIe Wi-Fi adapters, or a card and antennas for minis with a free slot.

Schools and larger offices that install machines over the network should check that network booting (PXE) is enabled in the firmware settings; the hardware supports it on almost every business desktop. Wired Ethernet also makes imaging dozens of machines far quicker than doing it over Wi-Fi.

Delivery, setting up and the first week

A pallet of towers is heavy and bulky; a box of minis is not. Allow space to unpack and test, and for recycling the packaging. Orders from this site of £2,000 and over arrive on our own delivery trucks, Monday to Friday between 9am and 5pm, so arrange for someone to receive them. Smaller orders come by insured Royal Mail Special Delivery or Parcelforce.

Before machines go to desks, power on and test every unit: start-up, the firmware settings, every USB port, the network, audio and the video outputs you plan to use. Give each machine its own asset label for your records. Then install your image on one unit, check it thoroughly, and roll it out to the rest.

Finally, keep a close eye on the first week. Most faults that matter in refurbished desktops show up in the first days of real use, and finding them then means they can be reported while it is still simple to do so.