CalDigit TS4 Thunderbolt 4 Dock Review (2026): The Desk Dock

Why you should trust this review

I cover laptop and workstation accessories, and I bought the CalDigit TS4 at retail to use as my own daily desk dock. CalDigit did not provide a sample. I compared it against an OWC Thunderbolt Dock and the Anker 7-in-1 PowerExpand+, all running off the same MacBook Pro 16 M4 Pro and a ThinkPad X1 Carbon Gen 12, so every comparison here is between units sitting on the same desk.

Over nine months I logged an estimated 1,500 hours of connected operation across two displays, a NAS, an external GPU enclosure, and a UHS-II SD reader. A dock at this price has to justify itself with reliability, not features on a box, so every figure below, dual 4K signal stability, 98W output, 2.36 Gbps Ethernet, came off my own meters and benchmarks rather than CalDigit’s marketing page.

How we evaluated

My dock protocol covers display, power, data, network, and thermals. For display I ran dual 4K 60 Hz across the DisplayPort 1.4 output and a downstream Thunderbolt 4 port in a 9-hour continuous test, watching for signal drops and EDID renegotiation. For power I measured wall input and used a USB-C power meter inline to read output to the host.

For data I benchmarked a four-disk RAID enclosure on a downstream Thunderbolt 4 port and a Samsung T7 Shield SSD on USB-A with Blackmagic Disk Speed Test, plus the UHS-II SD reader. Ethernet throughput came from iPerf3 sustained transfers to a wired Mac Studio on a 2.5 Gbps network. Thermals were logged at 30-minute intervals under sustained dual-display plus RAID plus Ethernet load. The full plan is on our methodology page.

Display performance: dual 4K 60 Hz, all day

The TS4 drives dual 4K 60 Hz across two outputs, one DisplayPort 1.4 and one downstream Thunderbolt 4. I ran a BenQ PD2705Q on DisplayPort and an Apple Studio Display on Thunderbolt, and across a 9-hour continuous test the dock held both signals cleanly: zero EDID renegotiations, zero flickers, zero resolution drops. That stability over a full workday is the whole reason to buy a Thunderbolt dock rather than a cheaper hub.

The dock also lists single 8K 60 Hz support on one Thunderbolt 4 output. I did not test that because I do not have an 8K monitor, so I will be straight about it: the underlying Thunderbolt 4 standard supports it and CalDigit documents the spec, but I cannot personally confirm it. Everything I did test ran flawlessly, and the dual-4K case is the one the vast majority of buyers actually need.

Power delivery: 98W where it matters

The TS4 delivers a measured 98W to the host over the upstream Thunderbolt 4 cable, which I verified with an inline USB-C power meter on the MacBook Pro 16 M4 Pro. During a 12-minute 4K Final Cut Pro export the laptop pulled a peak of 88W, and the dock held the battery at 100% throughout. Even during a 30-minute ProRes 422 HQ render that pushed CPU and GPU together and briefly hit 96W of draw, the battery stayed at 100%.

For typical office work across Lightroom, spreadsheets, multi-monitor browsing, and video calls, 98W sits comfortably above the laptop’s average pull and you never think about charging. On an M4 Max MacBook Pro 16 under sustained heavy creative load, expect occasional moments where draw briefly exceeds output and the battery holds rather than climbs. In normal mixed use I could not measure any drain at all.

Data, network, and the port count

The 18-port chassis is the practical heart of this dock. It carries dual Thunderbolt 4, five USB-A, three USB-C, DisplayPort 1.4, a 2.5 Gbps Ethernet jack, dual UHS-II card readers, and audio, which is how it replaces a tangle of cables and a couple of power bricks with a single connection. The throughput backs up the port count: a four-disk SoftRAID 0 enclosure on a downstream Thunderbolt 4 port benchmarked at 2,840 MB/s read and 2,620 MB/s write, near the Thunderbolt 4 PCIe ceiling.

The rest held up just as well. A USB-A 10 Gbps port ran a Samsung T7 Shield at 998 MB/s sustained, the UHS-II SD reader hit 289 MB/s read and 251 MB/s write (the fastest dock reader I have measured), and the Ethernet jack delivered 2.36 Gbps sustained in iPerf3, the realistic 2.5GBASE-T ceiling after overhead. If you have a multi-gig home network or hit a NAS daily, that Ethernet jack alone justifies a good chunk of the upgrade over a 1 Gbps hub.

Build, thermals, and the desk-only reality

The aluminum chassis is genuinely premium and built to sit on a desk for years. Under sustained dual-display plus RAID plus Ethernet load for 90 minutes, the top plate peaked at just 44 degrees Celsius, comfortably warm and roughly 5 degrees cooler than the Anker 7-in-1 under the same kind of load. The extra aluminum surface area does real cooling work, and it shows in the numbers.

The honest trade-offs are physical. At 800 grams plus a large external 230W power brick, this is unambiguously a desk dock, not something you toss in a bag. The brick needs its own bit of desk or floor space. And the list price is the highest in the category. None of that is a flaw so much as a statement of what the TS4 is: a permanent workstation anchor, not a travel accessory.

Who should buy the CalDigit TS4?

Buy it if you have a permanent desk with two 4K displays and a Thunderbolt 4 or USB4 laptop, you move between a laptop and a workstation setup daily and want one cable to dock everything, and you have a 2.5 Gbps network or run Thunderbolt peripherals like an eGPU or RAID. For that user it collapses eight to ten cables into one and pays for itself in reduced friction.

Skip it if you travel with your dock, since 800 grams plus a 230W brick rules that out, or if you only run one external display, where the Anker 7-in-1 PowerExpand+ covers the use case for a fraction of the price, or if your laptop lacks Thunderbolt 4 or USB4, in which case you are paying for capability you cannot use.

The verdict

After nine months as my desk anchor, the CalDigit TS4 is the best Thunderbolt 4 dock I have tested. It held dual 4K cleanly through full workdays, delivered measurably faster Ethernet and SD-reader speeds than anything else in the category, kept a MacBook Pro 16 topped up under load, and ran cooler than smaller hubs while doing it. It is expensive, heavy, and strictly desk-bound. But if you have the workstation setup to use all 18 ports, this is the dock that makes a single cable do the work of an entire cable drawer, and I would buy it again.