j5create JCD401 USB4 Dual 4K Multi-Port Hub review

j5create JCD401 review: two native displays when the computer supports the arrangement

The JCD401 is a compact USB4 hub for someone whose main need is external screens rather than a large collection of card and network connections. It offers HDMI, full-size DisplayPort and a USB-C display-capable socket, with two USB data connections and PD pass-through. The useful distinction is that the three video sockets provide choices for up to two external displays, not three independent desktops.

Its best fit depends on the exact computer. The original guide documents one screen up to 4K60 or two screens up to 4K30, with Thunderbolt 3, Thunderbolt 4 or USB4 required for two. It explicitly separates base M1/M2 Macs from the named Pro, Max and Ultra configurations. That is a more useful starting point than the “dual 4K” name alone.

Match the Mac chip before choosing two screens

j5create states that base M1 and M2 Macs support only one external display through this hub. It separately lists M1 Pro, M1 Max and M1 Ultra as supporting two in the original guide; the current product page also names M2 Pro and M2 Max. These exact distinctions should remain intact. A base M1 MacBook does not gain the Pro model’s display behavior because the dock has several output connectors.

The manufacturer also documents Windows and macOS extended-desktop support with the required host connection. A generic older USB-C computer is limited to one external screen in its stated fallback. Check the actual port specification and computer’s external-display limit, not just whether the hub’s plug fits.

This is a native display arrangement without an additional hub display-driver installation, according to the source. It is not a claim that a USB graphics driver can bypass a computer’s hardware display limits. It also does not establish every later Mac chip or closed-lid configuration that the manufacturer has not named.

Choose a supported pair of output connectors

The manufacturer lists three two-screen combinations: HDMI plus DisplayPort, USB-C plus DisplayPort, or USB-C plus HDMI. It does not provide two HDMI sockets or two full-size DisplayPort sockets. If both monitors have the same input, the physical cable arrangement therefore needs attention before purchase.

The original English guide gives a clear practical limit: one screen up to 3840 by 2160 at 60 Hz, or two screens up to 4K at 30 Hz. Some translated material and broad page language can look more generous, but this review does not turn an individual output’s 60 Hz maximum into dual 4K60. The current page itself advises setting dual monitors to a maximum of 4K30 if they do not display correctly.

A 4K-capable screen and suitable cable are still necessary. The USB-C display connection must also reach an appropriate monitor input; it is not interchangeable with a USB-C charging-only socket on a display. Plan the exact two cables rather than assuming three available output shapes remove all connector constraints.

USB data is 10 Gbps, separately from the host transport

There is one USB-A data socket and one multifunction USB-C data/video socket, each with an advertised ordinary USB data capability of 10 Gbps. That is different from the hub’s USB4 host transport. A headline about USB4 bandwidth should not be presented as proof that a normal USB 3.2 Gen 2x2 drive will negotiate 20 Gbps through a downstream socket.

Using HDMI and DisplayPort leaves the multifunction USB-C socket available for a USB-C peripheral. Choosing that socket for a monitor occupies it physically, so do not count it simultaneously as another socket for a drive. The USB-A connection remains useful for a keyboard receiver, drive or other suitable accessory, with bandwidth shared across the hub’s upstream link.

The manufacturer advises no more than one bus-powered portable hard drive at a time. For high-demand accessories it recommends connecting an appropriate PD source. Those instructions are more important than assuming that a USB4 label guarantees unrestricted accessory power or storage performance.

85 W pass-through needs a separate source

The JCD401 explicitly advertises up to 85 W of pass-through power for a compatible host. That is a host-output claim, not merely a power-input label. However, the reviewed package contains the hub and quick installation guide, so a suitable USB-C charger is separate. The computer must support USB-C PD to receive charging; a data/video connection without PD does not gain it through the hub.

The source’s electrical table contains an input-current entry that does not align cleanly with its 85 W output claim. Rather than invent an input ceiling from those inconsistent figures, this review retains the explicit 85 W pass-through specification and recommends confirming the exact required charger with the maker. Do not disconnect that source during file transfers, as the guide warns this can disrupt connected devices.

The right tradeoff

Choose the JCD401 for one or two documented native displays on an exactly suitable computer, with modest USB expansion and separate charging equipment. Its attached 200 mm cable and compact aluminum body fit that focused role.

Choose something else for built-in Ethernet, card readers, several USB-A peripherals or two independent displays on a base M1/M2 Mac. The correct host and output combination matters more than counting three video sockets.

Sources

j5create JCD401 current specifications and exact Mac notes; original English JCD401 guide, 202208-V2.