CalDigit TS4 Thunderbolt 4 Dock: Review, Pros & Cons

Summary

An 18-port Thunderbolt 4/USB4 desk dock with two downstream Thunderbolt 4 ports, 2.5GbE, 10 Gbps USB, UHS-II card readers and up to 98 W host charging. Check the host first: an 18-port dock does not override a base M1/M2 Mac’s one-external-display limit, and HDMI needs an active adapter.

Strengths

One-cable desk docking for Ethernet, USB, display and laptop power.
More connectivity than modest docks: 10 Gbps USB-A × 5, USB-C × 3, two downstream 40 Gbps TB4 ports, separate SD/microSD readers, 2.5GbE.
Aluminum housing, horizontal or vertical placement; host cable and adapter included.
Native Thunderbolt/DisplayPort video path avoids DisplayLink software for supported configurations.
TechRadar praised build and ports; Macworld still listed it among powerful Thunderbolt 4 docks in October 2026.

Weaknesses

No built-in HDMI; HDMI-only monitors need an active adapter.
External 230 W power brick is sizable; host cable is only 0.8 m.
Not every USB port supplies 20 W fast charge; ordinary ports are 7.5 W.
Base M1 and some hosts cannot run two native displays through it.
Wake/sleep can unmount drives or drop Ethernet/USB; firmware updates help but do not guarantee zero problems.
An asking price of $380 is nearly twice a basic $200 Thunderbolt 4 dock.

Verified specifications

Ports	18 by CalDigit’s count; 3 Thunderbolt 4 (one host, two downstream) at 40 Gbps; 3 USB-C 10 Gbps; 5 USB-A 10 Gbps; 1 DisplayPort 1.4; separate UHS-II SD and microSD; 1 2.5Gb Ethernet; front 3.5 mm combo audio; separate rear analog audio input and output; DC power input.
Host charging	up to 98 W via host Thunderbolt port; downstream TB4 up to 15 W each; front USB-C charging up to 20 W; other USB-C and each USB-A up to 7.5 W.
Included	0.8 m certified Thunderbolt 4 cable, dock, 230 W external power adapter and mains cord, two rubber foot strips. Size 141 × 42 × 113 mm; weight 0.64 kg excluding brick.
Supported hosts	Thunderbolt 3/4, USB4 and some USB-C computers/tablets; minimum macOS 11.4 and Windows 10 20H2.
Displays	up to single 8K on compatible Windows; dual 4K/60 on compatible Intel/Windows; dual 6K/60 on MacBook Pro M1 Pro/Max. Base M1 supports one external display. HDMI is not built in; DisplayPort needs an active adapter.
Firmware	45.1 (January 27, 2026) current published; 39.x addressed earlier issues.
Power supply	230 W rated capacity, not measured draw.

Full research notes and sources

Displays and host compatibility

Buying 18 ports does not override the host’s display limit. Base M1 Macs support one external display; base M3 supports two only in clamshell mode; Pro/Max M1/M2/M3 and supported M4/M5 Macs can provide two streams subject to the exact Mac’s specs. HDMI is not built in: the full-size DisplayPort needs an active adapter for conversion, and passive adapters may fail; the second monitor can use a downstream Thunderbolt port with a compatible USB-C video adapter. Manufacturer advertises up to single 8K on compatible Windows systems and dual 4K/60 on compatible Intel/Windows machines. Verify the exact laptop and monitor models before purchase.

Reliability and wake/sleep

CalDigit acknowledges affected Apple Silicon/macOS 12 configurations with crashes, unmounted drives, missing Ethernet after wake and occasionally an unresponsive Thunderbolt port; guidance is to update macOS and Thunderbolt firmware. A January 2026 MacRumors poster with an M1 Pro reported nearly two years trouble-free then repeated reconnect failures under macOS Tahoe, restored by Mac restart rather than unplugging devices; causation was not conclusively diagnosed. December 2024 forum reports describe displays failing to wake or needing firmware changes, while other owners reported about a year problem-free. No representative failure rate or median years to failure exists; forum posts are self-selected.

Is it worth it?

The TS4 suits a desk that needs many 10 Gbps USB ports, two downstream Thunderbolt 4 ports, 2.5GbE and UHS-II readers in one cable, and is worth about $380 only if those ports are used. For a basic dual-HDMI setup, the $199.95 Plugable TBT4-UD5 is the better value. For a Thunderbolt 5 laptop, the TS5 at $399.99 or the OWC TB5 dock at $329.99 win on bandwidth and charging. New TS4 listed at $379.99 at CalDigit (out of stock on the checked page) and $379.99 at B&H (in stock in that snapshot); open-box at $339.99 carried a one-year warranty instead of two. A good buy is $300 or less new with valid warranty; $300–$340 is reasonable if two downstream TB4 ports, extra USB-A, 2.5GbE and both UHS-II readers are mandatory; above about $350 cross-shop the TS5 or OWC TB5 dock. These are editorial thresholds against asking prices, not historical sale prices. No 12-month average price or universally available sub-$300 sale was established.

Which model this is

This page covers the CalDigit Thunderbolt Station 4 (TS4), an 18-port Thunderbolt 4 dock with three Thunderbolt 4 ports, 2.5GbE and UHS-II readers. Do not confuse it with the newer CalDigit TS5 (Thunderbolt 5, 15 ports, $399.99) or the TS3 Plus. Host and OS determine which features are available; a USB-C-only connection can lose 2.5GbE and full bandwidth.