CalDigit TS4 vs TS5: Which Dock Fits Your Desk?

Start with the laptop, not the newer number

A Thunderbolt 5 dock can connect to some earlier hosts, but the connection does not transform that computer into a Thunderbolt 5 system. CalDigit requires an 80Gbps Thunderbolt 5 or USB4 v2 link for the TS5's maximum bandwidth and features. On a 40Gbps laptop, the first buying question is therefore not whether the TS5 is newer; it is whether another difference solves a real need.

The TS4 has broader published minimums: macOS 11.4 or later, Windows 10 20H2 or later, and support for Thunderbolt 3, Thunderbolt 4, Thunderbolt 5, USB4 and capability-dependent USB-C hosts. The TS5's detailed Windows requirements start at Windows 11, Thunderbolt 4, a 12th-generation Intel processor and Thunderbolt NVM firmware 43.3. CalDigit separately supports Thunderbolt 3 Macs, but not Windows Thunderbolt 3 hosts. Check the exact computer rather than treating the connector shape as confirmation.

For a current Thunderbolt 5 computer moving large files to a suitably fast external SSD or RAID, TS5 can expose more PCIe bandwidth. CalDigit quotes up to 6,200MB/s for TS5 and 3,200MB/s for TS4, but these are manufacturer performance ceilings, not our benchmarks. The host, enclosure, drive, cable and workload all have to support the faster path.

Count the ports by job, not by headline total

TS4 is the stronger fit for a desk with several ordinary USB accessories. It provides three 10Gbps USB-C and five 10Gbps USB-A ports, alongside two downstream Thunderbolt 4 ports. TS5 shifts the balance toward Thunderbolt: it has three downstream Thunderbolt 5 ports, three 10Gbps USB-C ports, one 10Gbps USB-A port and one USB-A port intended for a keyboard or mouse at 480Mbps.

CalDigit's current TS5 page contains a conflict worth keeping visible. Its detailed interface list and product narrative describe two USB-A ports total—one 10Gbps and one 480Mbps—but the comparison table lists two 10Gbps USB-A ports plus a separate USB 2.0 port. The detailed interface inventory agrees with the TS5 manual and with the stated five-USB-port total, so this guide uses that inventory. Confirm the physical port diagram and exact package if the extra USB-A connection would decide the purchase.

The display cabling also changes. TS4 includes full-size DisplayPort 1.4, while TS5 has no dedicated HDMI or DisplayPort connector. Every TS5 screen therefore uses a downstream Thunderbolt port directly or through a suitable USB-C video adapter. Price those adapters and reserve enough downstream ports before calling the simpler-looking layout an upgrade.

Treat screen counts as host-specific routes

TS4 supports up to two external displays on a suitable host. CalDigit's single-8K and dual-6K headlines depend on the computer's DisplayPort version, HBR mode and DSC support, plus the chosen resolution and refresh rate. Base M1, M2 and M3 Macs generally remain limited to one external display through the dock; the exact Mac model still controls the native ceiling. Use the Mac display-limit guide before choosing by sockets alone.

TS5 expands the available display routes only when the host supports them. CalDigit currently documents dual displays for compatible Mac and Windows systems, three for M5 Pro or M5 Max Macs and supported Thunderbolt 5 Windows computers, and four for M5 Max. The fourth M5 Max screen requires a daisy-chainable Thunderbolt display, and higher refresh rates can require DSC or reduce color depth. Thunderbolt 4 Windows and Mac hosts do not gain the three-display TS5 route.

Bandwidth Boost is also display-oriented. TS5 can allocate up to 120Gbps toward demanding displays while leaving 40Gbps for the rest of the dock; it is not 120Gbps symmetrical data bandwidth. Write down the exact monitors, inputs, resolutions, refresh rates and whether the laptop display stays active, then compare that arrangement with the current manufacturer matrix.

Separate host power from the power brick

TS4 can provide up to 98W to the laptop from its included 230W supply. TS5 raises host delivery to 140W from a 240W supply. The larger adapter figure is not what reaches the computer: part of that capacity powers the dock and attached devices. Compare the 98W or 140W host output with the laptop's documented input and charging protocol.

A laptop that accepts only 65W does not charge at 140W merely because TS5 can offer it; USB Power Delivery negotiates an accepted level. Conversely, a workstation that needs more than 98W under load may make TS5's host output consequential. Keep the original charger in the plan when the dock cannot replace it, and use the charging guide to distinguish host power from adapter rating.

Both docks give each downstream Thunderbolt port up to 15W and include a front USB-C port that can provide up to 20W. Neither difference justifies a replacement by itself. Inventory the devices that need accessory power and confirm whether they expect data, video or charging from the same connection.

Choose the dock that removes an actual constraint

Choose TS4 when the desk needs five fast USB-A connections, a built-in DisplayPort socket, wider older-host support or no more than 98W to the laptop. Its 2.5GbE, dual UHS-II card readers, audio connections and physical footprint remain close to TS5. A TS4 owner using a 40Gbps host and one or two ordinary displays may gain little from replacing it.

Choose TS5 when a confirmed Thunderbolt 5 or USB4 v2 computer can use its extra bandwidth, when 140W host power replaces a separate laptop charger, or when three downstream Thunderbolt connections simplify the desk. Its host-specific high-refresh, triple- and quadruple-display routes are meaningful only when the exact computer and monitors appear in the documented arrangement.

Before buying, open the side-by-side comparison, count every cable and adapter, and keep any unresolved host condition visible. This comparison uses current published specifications; it does not claim hands-on throughput, wake reliability or monitor testing.

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