Thunderbolt 4 Explained: 40Gbps High-Bandwidth Interface Redefining Efficient Desktop Connectivity

In an era where high-speed data transfer and streamlined connectivity are essential for professional workspaces, Thunderbolt 4 has emerged as one of the most advanced interface technologies. Known for its ultra-fast bandwidth, versatile functionality, and broad compatibility, Thunderbolt 4 is rapidly becoming a central component of modern, high-performance desktop setups.

A Brief History: From Thunderbolt to Thunderbolt 4

Since its initial release in 2011, Thunderbolt has undergone significant evolution. Jointly developed by Intel and Apple, it has continually improved its speed, functionality, and universality.

Thunderbolt 4 builds on Thunderbolt 3 by enforcing stricter minimum performance and feature requirements, ensuring all devices meet high compatibility and reliability standards.

Core Advantages of Thunderbolt 4 for Desktop Workstations

1. Up to 40Gbps Bandwidth — No More USB 3.0 Bottlenecks

Traditional USB 3.0 KVM switches max out at 5Gbps bandwidth, which is insufficient for high-bandwidth peripherals like 4K cameras or external SSDs.
Thunderbolt 4-enabled KVMs such as the TESmart HDC202-X24 offer:

• Up to 40Gbps total bandwidth

• Up to 10Gbps per USB output port

• Lag-free operation with multiple demanding devices connected simultaneously

2. One Cable for Data, Video, and Power

Thunderbolt 4 integrates DisplayPort 1.4, USB4, PCIe 3.0, and Power Delivery protocols, allowing a single cable to carry:

• High-speed data transfer (storage devices, cameras, capture cards)

• High-resolution video output (dual 4K@60Hz or single 8K)

• Power delivery to connected devices (power capability upgrades in progress)

This drastically simplifies cable management and is ideal for clean, efficient workspaces.

3. Broad Compatibility and Flexible Expansion

• Backward compatible with Thunderbolt 3, USB4, and USB-C

• Supports daisy chaining for peripherals

• Cross-platform support for Windows and macOS

Thunderbolt 4 × TESmart HDC202-X24: A Game-Changer for Multi-Host Workstations

With multi-host and multi-device workflows becoming standard, Thunderbolt 4 unlocks powerful new possibilities for KVM solutions. The TESmart HDC202-X24 is a high-performance dual-monitor KVM switch designed for seamless host switching.

Dual Input Port Groups

• Thunderbolt 4 input + Thunderbolt expansion port

• HDMI + DisplayPort + USB-B input ports

This design supports a wide range of host devices, from Macs to Windows PCs, without sacrificing bandwidth or functionality.

Features

• Supports dual HDMI monitor output and multiple input signal formats

• Total bandwidth up to 40Gbps with 10Gbps per USB output port for smooth peripheral performance

• Allows charging of connected PC1 device via Thunderbolt (power delivery capability subject to upgrades)

• Cleaner cable management, reducing the need for external hubs or docks

The built-in Thunderbolt expansion port is ideal for connecting high-bandwidth USB devices directly to PC1 (usually a Thunderbolt-equipped laptop or Mac). This reduces Thunderbolt port occupation on the host device and enhances connectivity flexibility.

Important Note: External Display Limitations on Some Mac Models

Certain Apple Silicon Macs (such as the base MacBook Air and 13-inch MacBook Pro with M1/M2 chips) support only one external display due to hardware restrictions.
Even with the TESmart HDC202-X24, dual extended displays cannot be achieved on these models.
We do not recommend using this KVM with these devices for multi-display purposes. For full multi-monitor support, higher-tier Mac models like M1 Pro, M2 Pro, or M3 Pro and above are recommended.

Real-World Use Cases

Scenario 1: Professional Multi-Host Workflow

• Connect an M4 MacBook Pro to HDC202-X24 via a single Thunderbolt 4 cable

• Drive two 4K HDMI monitors simultaneously

• Control two computers with one keyboard and mouse set

• Use Thunderbolt expansion port for high-speed external storage

Scenario 2: Simplified Single-Cable Setup

• Replace bulky docks and hubs with one Thunderbolt 4 KVM

• Streamlined cable management and unified switching

• Lower heat generation and power consumption

• Enhanced system stability

Conclusion: Thunderbolt 4 Leading the Future of Connectivity

Thunderbolt 4 is more than just a faster connector; it represents a shift toward unified, simplified, and high-performance connectivity.
Paired with the TESmart HDC202-X24, users can effortlessly build multi-host, multi-screen workstations that maximize productivity.

Key Benefits Recap

• 40Gbps ultra-high bandwidth for lag-free performance

• Dual-monitor output to expand workspace

• Single-cable solution for clean desktop setups

• Built-in expansion port reduces the need for external hubs

Learn More

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