USB4 Version 2.0：80 Gbps 及更高速度
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新一代 USB 再次将速度翻倍，与 Thunderbolt 的界限变得模糊。
## 80 Gbps Symmetric, 120 Gbps Asymmetric
USB4 v2.0 uses PAM-3 signaling (same as Thunderbolt 5) to double bandwidth on existing USB-C cables. Asymmetric mode dedicates more bandwidth to one direction — perfect for driving high-res displays.
## Key Features
- **80 Gbps bidirectional** on new cables
- **120 Gbps asymmetric** for display-heavy workloads
- **Backward compatible** with USB4, USB 3.2, and USB 2.0
- **DisplayPort 2.1 tunneling** for 8K@60Hz or 4K@240Hz
- **PCIe Gen 4 tunneling** for eGPUs and fast storage
## When to Expect It
First USB4 v2.0 controllers shipped in late 2024 (Intel Arrow Lake). Expect widespread adoption by 2025-2026 in laptops and docks.
## Do You Need New Cables?
Existing USB4 40 Gbps cables work at reduced speed. For full 80 Gbps, you'll need new cables certified for USB4 v2.0. Thunderbolt 5 cables also work.