Lenovo ThinkCentre M900 Tiny: the sleeper hit of home office PCs

Every used PC market has a quiet winner. The listing that shifts in steady numbers month after month, gets snapped up before the photos go live, and never quite gets hyped. In 2026, that machine is the Lenovo ThinkCentre M900 Tiny, along with its close cousins the M910 and M920.

For a home office setup that needs to boot fast, run cool, sit invisibly behind the monitor and last another five years, nothing at this price does the job better.

What the M900 Tiny actually is

The M900 Tiny is a 1 litre desktop that Lenovo launched in 2016 as part of the ThinkCentre business range. The chassis measures roughly 179 by 183 by 34mm and weighs about 1.3kg. It uses a laptop style 65W or 90W external power brick rather than an internal PSU, which is why the box can be so small.

Inside, Lenovo squeezed two SODIMM slots, an M.2 2280 NVMe slot, an M.2 2242 slot that most buyers forget about, a 2.5 inch SATA bay, and a WiFi card slot. The rear panel gives you DisplayPort, a second DisplayPort or HDMI depending on config, four USB 3.0, gigabit ethernet, and a serial header for offices that still need one.

The M910 refreshed the platform to 7th gen Kaby Lake in 2017. The M920 landed in 2018 with 8th gen Coffee Lake. All three take the same VESA mount kit and power bricks.

Why the i7 6700T is the sweet spot

The tested unit most Birmingham AV buyers land on is the M900 Tiny with a Core i7 6700T. The T suffix confuses people, so it is worth explaining.

The 6700T is a 35W TDP quad core, eight thread Skylake part running at 2.8GHz base and 3.6GHz turbo. Same silicon as the desktop 6700K, binned for low power. In a 1 litre chassis with a single blower fan, that 35W envelope is exactly what makes it work. The machine idles under 10W. Under sustained load it barely breaks 45W at the wall.

For real home office workloads, spreadsheets, browser tabs, Teams calls, light photo editing, occasional Docker, the 6700T is still comfortable in 2026. Cinebench R23 puts it around 3800 points multi core, roughly matching a modern low end laptop that would cost £500 new.

The upgrade path nobody advertises

This is where the M900 Tiny stops being cheap and starts being genuinely clever.

The two SODIMM slots officially accept 32GB total. 2x16GB DDR4 2133 SODIMMs drop in and post first time on every recent BIOS. That is more RAM than most new mid range office laptops ship with in 2026.

The primary M.2 2280 slot takes a full length NVMe SSD up to 2TB. The second M.2 2242 slot, originally intended for an Intel Optane cache module, will happily run a short M.2 SATA SSD. Add a 2.5 inch SATA drive in the bay and you have three internal storage devices in a chassis smaller than a hardback book.

The WiFi card is a standard M.2 2230 A+E key slot, so a WiFi 6 upgrade is a ten minute swap.

VESA mount and the invisible desk

The reason the M900 Tiny keeps selling is not the specs. It is the mounting bracket.

Lenovo shipped these machines with an optional VESA kit that clips the PC onto the back of a monitor. The bracket sits between the monitor and a standard 100x100mm VESA arm. The PC clicks in from the side. The result is a desk with a monitor, a keyboard, a mouse, and no visible PC at all.

For anyone working from a small home office, this matters. A tower under the desk collects dust and kicks. The Tiny disappears behind the monitor and stays there for years.

See the tested Lenovo M900 Tiny i7 32GB build on eBay

Price per inch, and what it actually means

The phrase "price per inch" is deliberate. For a home office buyer, the most honest measure of value is desk space.

A 1 litre chassis at £150 to £180 with 32GB RAM and a fast NVMe SSD works out at roughly £15 per litre of desk space consumed. A comparable mini tower occupies six to eight times the volume for the same compute. A laptop needs less space when closed but adds a keyboard and screen you did not need.

The M910 and M920 sit higher in price, roughly £180 to £250 depending on config, but follow the same rule. A clean M920 with an i5 8500T at £180 is still the best small footprint desktop deal on the used market in 2026.

What to actually buy

The listing worth pointing to is a Birmingham AV built M900 Tiny with the i7 6700T. RAM configurations across the listings run from 16GB up to the full 32GB. Storage runs from a 256GB NVMe on the entry tier up to 1TB NVMe plus a second SATA drive on the higher tier. Every unit ships with Windows 11 Pro activated, a fresh thermal paste service, a WiFi 6 card upgrade where applicable, and the twelve month Birmingham AV warranty.

FAQ

Will the M900 Tiny run Windows 11 officially?

Not on the Microsoft compatibility list. The Skylake 6700T is one generation below Microsoft's official cutoff. Every unit shipped by Birmingham AV runs Windows 11 Pro via the supported bypass path that Microsoft itself documents for enterprise deployments. Updates arrive normally. The M920 is fully officially supported.

Can I game on it?

Light gaming only. The integrated HD Graphics 530 will handle older esports titles at 1080p low. Anything from the last five years will not run at playable frame rates. There is no room for a discrete GPU in the 1 litre chassis.

How loud is it under load?

Quiet. The single blower fan sits at roughly 26dB at idle and climbs to about 34dB under sustained CPU load. In practice the PC is inaudible over normal keyboard typing.

What about the M710q and M715q?

The M710q is the low cost sibling of the M910 with a smaller motherboard and only one M.2 slot. Fine for basic work but not the same value once you factor in the upgrade ceiling. The M715q is the AMD Ryzen version, which has quirks and a smaller used supply in the UK. For a first buy, stick with the Intel M900, M910 or M920.

Is 32GB overkill for a home office?

Not in 2026. A modern browser session with fifteen tabs, Teams, Outlook, an Office document, and a VPN client will comfortably sit at 12 to 16GB of used RAM. Adding a Docker container or a virtual machine pushes past 20GB. 32GB gives the machine another three to five years of headroom.

About Birmingham AV

Birmingham AV Ltd has sold over 87,000 items on eBay since 2017, with 24,756 buyer feedbacks at a 98.9 percent positive rating. That places us among one of the highest volume refurbished PC operations on eBay UK. Every unit ships with a full twelve month return to base warranty, tested and imaged in Bromsgrove, Worcestershire. Companies House 12383651. VAT registered GB 348755066.