Thunderbolt 4 vs Thunderbolt 3 Cable: Key Differences in 2026
By Plugable #1 in Docking Stations and USB Devices ~ Plugable ... | Published: 2026-10-26
Category: Comparisons
Compare Thunderbolt 4 vs Thunderbolt 3 cables: speed, power delivery, and compatibility. Find out which cable fits your setup in 2026.
Quick answer
Thunderbolt 4 and Thunderbolt 3 cables both deliver 40Gbps speeds, but Thunderbolt 4 adds support for up to 240W charging via Extended Power Range (EPR) and is fully backward compatible. Choose Thunderbolt 4 if you need future-proof high-power delivery; Thunderbolt 3 remains a reliable, lower-cost option for docks and displays.
Speed and data performance
Both Thunderbolt 4 and Thunderbolt 3 cables support 40Gbps data transfer speeds. This means you can connect two 4K displays or one 8K screen with either standard. For most users, the raw speed is identical, so the choice depends on power needs and future compatibility.
Power delivery: the key difference
The biggest upgrade in Thunderbolt 4 is Extended Power Range (EPR), which allows up to 240W charging. Standard Thunderbolt 3 cables are limited to 100W. If you need to charge a high-performance laptop or run power-hungry peripherals, a Thunderbolt 4 EPR cable is essential.
Compatibility and certification
Thunderbolt 4 cables are backward compatible with Thunderbolt 3 and USB-C devices. They also meet stricter certification requirements, ensuring consistent performance across hosts and docks. Thunderbolt 3 cables work with Thunderbolt 4 ports but may not support EPR power levels.
Trade-offs at a glance
- Thunderbolt 4 EPR cable (Plugable 2616022): Supports 240W charging via EPR, 40Gbps speed, and two 4K or one 8K display. Backward compatible with Thunderbolt 3 and USB-C. Best for users who need high-power charging or want maximum future compatibility.
- Thunderbolt 3 cable (Plugable 2616016): Delivers 40Gbps speed and 100W power. Works with Thunderbolt 3 docks and displays. Not EPR-capable. A solid pick for standard Thunderbolt workflows where 100W charging is sufficient.
- Key trade-off: Thunderbolt 4 adds 240W EPR and tighter certification at a higher price. Thunderbolt 3 saves money but lacks high-power charging.
Product comparison
- Plugable Thunderbolt 4 240W EPR Cable (3.3ft/1m): The Plugable Thunderbolt 4 EPR cable delivers 40Gbps data and up to 240W power with Extended Power Range. Ideal for charging high-wattage laptops and future-proofing your setup for upcoming devices.
Plugable Thunderbolt 4 240W EPR Cable (3.3ft/1m) - Plugable Thunderbolt 3 Cable (40Gbps, 2.6ft/0.8m): The Plugable Thunderbolt 3 cable offers 40Gbps speeds and 100W power in a compact 2.6ft length. A cost-effective choice for docks, displays, and standard charging without needing EPR.
Plugable Thunderbolt 3 Cable (40Gbps, 2.6ft/0.8m)
Which cable should you choose?
Best for
- Users who need to charge a high-performance laptop (e.g., 140W+)
- Anyone building a future-proof setup with Thunderbolt 4 docks or devices
Not for
- Users on a tight budget who only need 100W charging
- Those connecting only Thunderbolt 3 docks and displays without EPR requirements
