Quick Answer / Summary: C-to-C cords come in tiers: 2.0 (480 Mbps, charge to 60 W), 3.2 Gen 1 (5 Gbps), Gen 2 (10 Gbps), Gen 2×2 (20 Gbps). Charging follows Power Delivery up to 100 W on 5 A e-marked cords; 3 A cords stop at 60 W. Video over DP Alt Mode needs a full-featured cord. The single buying rule: state the duty (charge, storage, video, dock), then buy the tier the duty requires.
The C-to-C cable is the most capable cord in the USB family – and the most confusing to buy, because identical-looking products span 60x in data speed and 16x in charging power. The connector is standard; everything else is a tier decision. This guide turns the C-to-C category into a readable matrix.
The Tier Matrix
Four data tiers share one connector. USB 2.0: 480 Mbps – the charge-and-sync cord that powers earbuds and phone backup duty at commodity prices. USB 3.2 Gen 1 (the 3.0 of C): 5 Gbps – SSD-class storage at 400-450 MB/s. Gen 2: 10 Gbps – fast storage and dock duty. Gen 2×2: 20 Gbps – flagship SSDs. Each tier’s cord carries progressively more conductor pairs; each costs more. The C connector itself never reveals the tier – the listing or datasheet must, and fleets should label the cords once and forever.
The 60x Spread
2.0’s 40 MB/s to Gen 2×2’s 2,500 MB/s is the widest capability spread in any cable family – which is why ‘it’s just a C cable’ reasoning fails. The spread is the reason this guide exists: one sentence of duty-matching replaces the entire returns taxonomy.
Power Delivery and the e-Marker
PD charging negotiates voltage and current over the CC line: 3 A cords (most commodity C-to-C) top at 60 W; 5 A cords carry an e-marker chip in one plug that announces their rating, unlocking 100 W (and 240 W on EPR-era gear). The e-marker is invisible and essential at high wattage – a 5 A device on a 3 A cord charges slower; a 100 W laptop on a no-name cord negotiates down to what the cord declares. Buy the wattage the device needs and no more: e-marked 100 W cords cost more and serve laptops, not earbuds.
The Charging Families
60 W class: phones, tablets, small laptops. 100 W class: full-size laptops, docks, monitors’ upstream ports. Each class, one SKU, labelled – the charging fleet stops being a mystery drawer.
Video, Docks and the Full-Featured Question
DP Alt Mode tunnels DisplayPort over the C connector’s SuperSpeed lanes: 4K60 and beyond ride Gen 1-plus tiers’ lane sets on full-featured cords. A 2.0-tier C-to-C cord physically lacks the lanes – no video, ever, regardless of the devices. Docks are the demanding customer: they combine PD input, multi-lane video and USB data, and they earn full-featured, e-marked cords by definition. The buying matrix in one line: charge-only buys 2.0/3 A; storage buys Gen 1/Gen 2; video and docks buy full-featured Gen 2, 5 A.
The Dock Cable Rule
Docks ship with their cord for a reason – the dock designer specified the tier, wattage and length. Replacing a dock cable with a bargain cord re-creates every problem the original specification prevented; keep the original, label it, and treat replacements as spec purchases.
C-to-C Tier Matrix
| Tier | Data | Charging | Video | Typical Duty |
|---|---|---|---|---|
| USB 2.0 | 480 Mbps | Up to 60 W | No | Charge + light sync |
| 3.2 Gen 1 | 5 Gbps | 60 W (3 A) | 4K30 basic | SSD storage |
| 3.2 Gen 2 | 10 Gbps | 100 W (5 A e-marker) | 4K60 | Fast storage, docks |
| 3.2 Gen 2×2 | 20 Gbps | 100 W (5 A e-marker) | 4K60+ | Flagship SSDs |
Real-World Application Scenarios
A design studio equips edit bays with Gen 2 5 A cords for SSD and dock duty, and 2.0 cords for the charge shelf – two SKUs, labelled, zero tier confusion. A laptop fleet’s travel kits carry one e-marked 100 W cord per bag. A home desk runs a 60 W Gen 1 cord for everything, correctly, for years.
Recommended Internal Resources
(1) Product cluster – https://zh-zong.com/productlist/ (anchor: the full C-to-C tier family, e-marked builds with test reports); (2) FAQ – https://zh-zong.com/faq/ (anchor: tier, wattage and alt-mode questions); (3) Contact – https://zh-zong.com/contact/ (anchor: request duty-matched cord sets and OEM specifications).
- the full C-to-C tier family, e-marked builds with test reports
- tier, wattage and alt-mode questions
- request duty-matched cord sets and OEM specifications
Related Reading in This Series
- Type-C to Micro-B Cable: Connect USB 3.0 Drives to Modern Machines
- USB-C Data Cable: What Your Cord Can Actually Carry, 480 Mbps to 40 Gbps
- 20 Gbps USB-C Cable: Gen 2×2, Who Needs It and What It Costs
Frequently Asked Questions (FAQ)
Q: Are all USB-C to USB-C cables the same?
A: No – the connector is standard but the tiers differ by 60x in data speed, and charging spans 60-100 W depending on e-marker. State the duty; buy the tier.
Q: Do I need an e-marked cable?
A: Only above 60 W – laptops, docks and 100 W chargers need the 5 A e-marked cord. Phones and tablets charge identically on 3 A cords.
Q: Why won’t my monitor get video through the C cable?
A: A 2.0-tier cord lacks the lanes DP Alt Mode needs. Video requires a full-featured 3.x cord between the source and the display.