Dell Precision 3420 review: specs, options & used prices

What this machine is

As used-market workstation desktops go, the Dell Precision 3420 (2015) is a known quantity: standard parts, a wide configuration ladder, and steady supply on the secondary market.

Workstation lines exist for sustained professional loads: server-derived CPU options, high memory ceilings, and a chassis designed to run all day rather than all morning.

Tracked used listings cluster around a median of $120 (6 active listings at the time of writing).

Configurations you will actually see

Configurations we track pair the Precision 3420 with the Core i7-7700, Xeon E3-1220 v5, Xeon E3-1240 and 2 more. These are 7th-generation Intel Core parts. This generation predates official Windows 11 support, worth factoring in if a modern OS baseline matters to you.

Memory options run from 8 GB to 32 GB (8 GB, 16 GB, 32 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 128GB SSD and 256GB SSD.

Hard-disk listings (128GB HDD and 1TB HDD) also exist — an SSD remains the single most noticeable upgrade on this class of machine.

Workstation notes

Workstation configurations target engineering, CAD, rendering and virtualisation workloads that run for hours, not minutes.

Expect higher idle draw and more fan noise than office small-form-factor machines; these were designed to be worked, not to whisper.

Who it fits

It fits engineering, CAD, rendering and pro-workstation roles on a budget — as long as the software tolerates the age of the platform. It predates official Windows 11 support, which makes it a natural Linux or light-duty candidate — a real factor if a modern OS baseline is required.

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

Verdict

Judged as a tool rather than a toy, the Precision 3420 holds a clear niche at the sensible end of the used market.

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 $100 to $220, and most of that spread is configuration, not condition.

Our composite LB Score currently sits at 13/100 — a score that mostly reflects the platform age — use it to compare like with like, not against modern hardware.

At this age, plan for the drive first, the memory second, and treat the rest as a bonus.