Our take
Lexmark identifies part 20G0350 as the T644n, a monochrome laser printer designed around a wired high-volume workflow. The specification rates it up to 50 pages per minute and recommends 5,000–30,000 pages monthly. Standard input holds up to 600 sheets. Ethernet, USB 2.0 and parallel connectivity give several ways to attach it, but standard automatic duplex is not included; Lexmark lists duplex as an available accessory. Wireless likewise depends on optional print-server hardware. This is a strong fit only when the office can use its speed, workload tier and wired interfaces, and when the exact physical unit has the required options installed.
A fixed high-volume mono queue with wired network access, where standard duplex is unnecessary or a compatible accessory is verified..
Avoid it for a light personal desk, built-in Wi-Fi, standard automatic duplex, copy and scan work, or buyers seeking a current compact model.
Pros & cons
What could work for you, and what to consider before buying.
What works in its favor
- Lexmark rates the T644n up to 50 ppm and recommends 5,000–30,000 pages monthly.
- The standard paper input reaches 600 sheets for fewer routine refills.
- Ethernet, USB 2.0 and parallel provide documented wired connection choices.
What to weigh up
- Duplex is an accessory rather than a standard feature on the T644n.
- Wireless printing requires optional print-server hardware instead of built-in Wi-Fi.
- Its large enterprise workload and older platform may be more than a smaller office needs.
The key details
| Model covered | T644n (20G0350) |
|---|---|
| Main functions | Monochrome print only; up to 50 ppm |
| Print output | Up to 600 sheets of standard input; duplex is an accessory |
| Two-sided printing | 10/100 Ethernet, USB 2.0 and parallel; recommended 5,000–30,000 pages monthly |
Performance figures are manufacturer claims. Source checked October 9, 2026. Regional models and included accessories can differ.
What the features mean for you
A workgroup printer with a clear volume tier
Lexmark maps part 20G0350 to the T644n and describes a monochrome print-only laser printer. The manufacturer rates it up to 50 pages per minute and gives a recommended monthly volume of 5,000 to 30,000 pages. That places it in a heavy office class rather than an occasional-use home role. The recommendation is more useful for routine planning than a peak duty-cycle figure, but it does not predict toner costs or the lifespan of a used device. A team should compare its actual average and peak work with the published range before selecting a machine of this size.
Standard feeds can support fewer interruptions
Lexmark lists up to 600 sheets of standard paper input for the T644n. A larger paper supply can reduce how often a shared queue needs refilling and help the printer stay ready for a team. However, paper capacity does not mean Lexmark recommends printing 600 sheets every day, and it does not guarantee performance with every media weight or tray setup. Check the exact product configuration and user guide for standard versus optional feeders, and verify which trays are physically present on a used unit. A buyer who needs several different stocks should confirm the available sources and supported media before relying on the capacity figure.
Duplex depends on the optional assembly
The exact T644n specification lists duplex as an available accessory, not standard equipment. A buyer should therefore not treat a generic T644n listing as an automatic-duplex model. If two-sided output is required, ask the seller for the accessory part number and a demonstration using the actual printer. Without the attachment, duplex jobs require manual handling or a different device. That distinction can change a high-volume workday: an optional feature that is absent adds time to every double-sided packet. The profile reflects the standard model rather than assuming a seller has installed an accessory.
Three ports favor a wired environment
Lexmark lists 10/100 Ethernet, USB 2.0 and parallel interfaces. Ethernet supports a shared wired network, while USB and parallel offer direct or legacy connection options where the computers and print server still support them. Wireless connectivity is not standard; the source describes an optional print-server accessory. That can be adequate in an office with cabling and a stable device location, but it is not equivalent to built-in Wi-Fi. Before buying, check the network requirements, driver availability and any required server hardware. Confirm that the specific unit's ports match the configuration rather than relying on a product-family description.
Age and accessories need separate verification
The T644n's specification can guide a buyer about model capabilities, but it cannot describe an individual printer's condition. For an older machine, check the 20G0350 part label, page count, print sample, paper feed, installed duplex option, tray assembly, toner status and return coverage. Lexmark's page also does not confirm whether the seller includes an optional print server. The exact-model purchase search is tagged for convenience but does not assert that an offer is current or that a historical ASIN maps to this configuration. Confirm a compatible driver and the office's supply plan before putting a high-volume device into service.
What else to compare
Choose a standard-duplex mono printer if you do not want to source an accessory, or a model with built-in wireless for flexible placement.
Before you buy
Is automatic duplex standard on the T644n?
No. Lexmark lists duplex as an available accessory, so verify the exact assembly is installed.
Does the T644n have built-in Wi-Fi?
Lexmark describes optional print-server hardware; built-in wireless is not standard on the reviewed model.
What monthly volume does Lexmark recommend?
Lexmark publishes a recommended range of 5,000 to 30,000 pages per month.
Which standard connections are documented?
Lexmark lists 10/100 Ethernet, USB 2.0 and parallel on the T644n.
Where can I check the current price?
Use the Amazon link for current offers. Check the exact model, seller, product condition, delivery, and return terms. This page does not display a live price or confirm stock.
Sources & review basis
We use the following manufacturer documentation for the product features above. Our suitability notes and buying advice are editorial judgments based on those features, not measured performance results.
- Lexmark U.S. T644n product specifications and part mapping ↗ — checked October 9, 2026.
- Lexmark U.S. T644n specifications: model 20G0350, speed, volume, input, duplex and interfaces ↗ — checked October 9, 2026.
The decision
The T644n is a wired high-volume printer with strong paper capacity and a 50 ppm rating, but buyers must verify optional duplex, wireless hardware and unit condition.
Is it the right fit?
Check the exact model and today’s offers on Amazon.