StarTech.com

StarTech.com 4 Port RS232 Mini PCI Express Serial Card w/ 16650 UART (MPEX4S552)

Name: StarTech.com 4 Port RS232 Mini PCI Express Serial Card w/ 16650 UART (MPEX4S552)
Brand: StarTech.com
SKU: B005WKI6R2

Bottom line: The StarTech.com 4 Port RS232 Mini PCI Express Serial Card w/ 16650 UART is a specs-and-price decision rather than a crowd-consensus one in the expansion cards category. Check the specification table below against one or two close alternatives — on price and spec fit, not on star ratings.

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By Mike Perry, Founder & Editor-in-Chief · Listing data updated 2026-10-22

Mike Perry — Hardware researcher since 2014. For retro PC hardware and period-correct parts, synthesises manufacturer documentation, community compatibility lists and marketplace listings rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference. About the author →

Pros & Cons

Pros

✓ Four high speed RS232 serial ports with data transfer rates up to 921.6 Kbps

Cons

✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
✗ Used and vintage listings vary by seller and condition — check the listing photos, description and return terms before buying

SpecPicks Verdict

SpecPicks scored StarTech.com 4 Port RS232 Mini PCI Express Serial Card w/ 16650 UART using a rating × review-volume × price-fit model applied to published specs and reviews across the expansion cards category. StarTech.com's expansion cards lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for expansion cards of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Key Features

Four high speed RS232 serial ports with data transfer rates up to 921.6 Kbps
High Performance 16650 UART
Includes 4x 30cm IDC to DB9 serial cables
256-byte deep FIFO per transmitter and receiver
Native single-chip, single lane PCI Express

Full Specifications

Brand	StarTech.com
Style	Classic
Compatible Devices	Embedded Systems with mini-PCIe slot
Hardware Interface	PCI

Ready to buy?

StarTech.com 4 Port RS232 Mini PCI Express Serial Card w/ 16650 UART (MPEX4S552) is vintage hardware; the used and vintage market on eBay carries most of the live inventory. Prices and condition vary by seller and move in real time, so we link the live listing rather than quote a cached price. It also has an Amazon listing — check it for current price and availability. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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