Our take
The Lexmark MX511de is a monochrome laser MFP with print, copy, color scanning, network scanning, and fax functions. Lexmark lists integrated automatic duplex, Gigabit Ethernet, a 250-sheet input tray plus a 100-sheet multipurpose feeder, and a print speed up to 42 pages per minute on A4 paper. Its wired connectivity makes it a candidate for a small or medium office that needs a fax-capable shared device. Wi-Fi and a comparable recommended monthly range are not established in the exact source reviewed, so neither is assumed.
A wired small or medium workgroup needing mono fax, scan, copy, and automatic two-sided printing..
Choose a different model if built-in wireless, a documented high monthly recommendation, color printing, or a verified duplex-scan feeder is essential.
Pros & cons
What could work for you, and what to consider before buying.
What works in its favor
- Lexmark confirms fax, copy, network scanning, and color scanning alongside monochrome laser printing.
- Integrated duplex and Gigabit Ethernet support a shared wired document workflow.
- The 42 ppm A4 rating and 250-sheet tray plus feeder provide useful exact-model planning details.
What to weigh up
- Wireless is not listed among the standard ports for this exact MX511de configuration.
- The reviewed specification does not provide a monthly recommended page range, so the duty cycle is not used as a substitute.
- The feature list does not establish that the document feeder scans both sides in one pass.
The key details
| Model covered | MX511de (35S5783) |
|---|---|
| Main functions | Monochrome print, copy, color scan, network scan, and fax |
| Print output | Up to 42 ppm A4; integrated automatic duplex |
| Two-sided printing | Gigabit Ethernet; 250-sheet tray plus 100-sheet feeder |
Performance figures are manufacturer claims. Source checked October 5, 2026. Regional models and included accessories can differ.
What the features mean for you
Fax, scan, copy, and black printing
Lexmark's exact model page lists the MX511de as a black-and-white laser device with copying, color scanning, printing, network scanning, and fax. It can therefore cover several paper-based office tasks without adding color printing. Keep these distinctions clear when comparing it: a color scanner captures color files, but the print engine remains monochrome. Fax is explicitly listed here, unlike on some related Lexmark MFP variants. Before choosing a neighboring MX-series listing, match the full model name and part number instead of assuming every suffix shares the same functions.
Automatic two-sided output
The included paper handling specification names integrated duplex, so the MX511de can turn supported sheets automatically for two-sided print jobs. That feature can reduce manual steps on multipage reports. It says nothing by itself about scanning both sides of originals; the product page's ADF and scan specifications need to be checked separately for that workflow. Standard input is 250 sheets plus a 100-sheet multipurpose feeder, while optional trays can be considered only if confirmed on the actual unit. Check the duplex module and tray setup in a used listing before relying on the original configuration.
A wired office connection
Lexmark identifies Gigabit Ethernet and several USB interfaces as standard ports. This supports a wired shared queue and direct service connections, but the exact page does not list built-in Wi-Fi for the MX511de. Offices with wireless-only desks should verify an exact supported option or consider a model with built-in wireless. For network scan, the available destinations and access controls should be checked against the office's own file server and security policy. A fast Ethernet port is useful only when its installation and administration are compatible with that environment.
Rated output and workload evidence
Lexmark rates print speed up to 42 pages per minute on A4 paper, with a stated first page time as fast as 6.5 seconds. Those are specification figures, not a guarantee for every file or for a machine whose age and maintenance are unknown. The exact source reviewed does not provide a recommended monthly range. Avoid using the maximum duty-cycle number to fill that gap: maximum capacity and recommended routine volume answer different questions. A buyer with sustained high output should seek a documented average recommendation or a service plan before treating this model as a fit.
Verify the MFP's current configuration
The historical candidate title identifies the MX511de and Lexmark part number 35S5783, which helps separate it from close family models. On a current offer, inspect the model label, Ethernet port, duplex path, document feeder, fax connection, touch display, trays, toner and imaging supplies, and return provisions. A product page establishes the model's designed features, not the condition of an individual unit. Driver support also matters for an older device and current computer fleet. No present stock, pricing, or hands-on condition is asserted in this comparison.
Who should shortlist the MX511de
The MX511de is a useful comparison for a wired office that wants mono print, copy, scan, fax, and automatic duplex in one machine. It becomes less attractive when wireless is a hard requirement or when the buying decision depends on an exact monthly range absent from the reviewed material. Compare it with the Dell S2815dn if a published workload band is important, or with the MX610de if fax is unnecessary and Lexmark's higher documented range suits. The right choice follows the actual document workflow rather than the number of functions on a panel.
What else to compare
The Dell S2815dn provides a published 750–4,000 page monthly range with fax and auto duplex; the MX610de has a 2,000–15,000 range but does not list fax.
Before you buy
Does the MX511de support fax?
Yes. Lexmark lists faxing as a function of the exact MX511de model.
Does it print both sides automatically?
Yes. Integrated duplex is listed in Lexmark's included paper-handling specification.
Is built-in Wi-Fi documented?
The reviewed exact model page lists Gigabit Ethernet and USB but does not list standard built-in Wi-Fi.
Does the scanner capture both sides in one pass?
The source reviewed here does not establish duplex ADF scanning for the MX511de, so confirm the feeder specification before relying on it.
What monthly page range is recommended?
A recommended monthly range is not stated in the exact specifications reviewed for this guide.
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 MX511de exact-model specifications ↗ — checked October 5, 2026.
- Lexmark MX511de exact functions, ports, included duplex, and paper capacity ↗ — checked October 5, 2026.
- Lexmark MX511de model and intended monochrome laser use ↗ — checked October 5, 2026.
The decision
Shortlist the MX511de for wired monochrome fax and automatic duplex. Verify the exact 35S5783 configuration, feeder behavior, driver support, and installed accessories.
Is it the right fit?
Check the exact model and today’s offers on Amazon.