HP ProDesk 400 G6 review: specs, options & used prices

What this machine is

The HP ProDesk 400 G6 is a small form factor, and on the used market it is one of the straightforward ways to get a complete, serviceable computer for a modest sum.

Business-line machines are the backbone of the secondary PC market for a practical reason: they were sold in large volumes to offices, serviced professionally, and then retired in bulk.

Tracked used listings cluster around a median of $130 (5 active listings at the time of writing).

Configurations you will actually see

Configurations we track pair the ProDesk 400 G6 with the Celeron G4930 and Core i5-9500. These are 9th-generation Intel Core parts. From the 8th generation on, these generally meet Windows 11 requirements.

Memory options run from 8 GB to 16 GB (8 GB, 16 GB). 8 GB is workable for one person; 16 GB is the comfortable setting for typical office and home use.

Solid-state storage options include 256GB NVMe and 256GB SSD.

Upgrade path and running costs

The compact chassis accepts standard low-profile parts, and drive bays are typically accessible without tools. The trade-off is a small, often proprietary power supply — check it before planning any graphics add-on.

Our compactness rating for this chassis: 75/100 — compact by design.

Who it fits

If the task is browsing, office documents, video calls, or a kiosk/POS role, the ProDesk 400 G6 does the job at a low sensible price.

The spec sheet carries the full option ladder and tracked prices; for context, browse the desktop catalog or the HP desktops page.

Verdict

The ProDesk 400 G6 is not exciting, and that is the point: a known quantity with a known configuration ladder.

Buy it when you need a cheap, repairable machine for its class of work, and verify the configuration before paying — RAM and storage vary widely between listings. Tracked prices span $69 to $200, and most of that spread is configuration, not condition.

Our composite LB Score currently sits at 11/100 — a score that mostly reflects the platform age — use it to compare like with like, not against modern hardware.