Confidence model
| Level | What it means |
|---|---|
| Calculated | A transparent arithmetic result from the values you entered. |
| Declared fit | Publicly stated capabilities are consistent, but real negotiation was not observed. |
| Needs verification | A required capability is missing, ambiguous, vendor-specific, or dependent on exact topology. |
| Measured | Not produced by this site. Requires hardware or trusted operating-system telemetry. |
Primary technical sources
- USB-IF — USB Charger (USB Power Delivery)Public overview of USB PD and power delivery up to 240 W.
- USB-IF — Cable and connector compliance updatesPublic clarification of certified cable power and data-rate markings.
- USB-IF — Certified USB-C cable power rating logos60 W and 240 W consumer identification program.
- VESA — DisplayPort over USB-CPublic explanation of DP Alt Mode and high-speed lane use.
- VESA — DisplayPort Alt Mode 2.0 overviewPublic payload figures and two-lane/four-lane scenarios.
- Apple Support — If a USB-C power adapter is not charging a Mac laptopVendor troubleshooting guidance, including cable isolation.
Calculation notes
Charging
The preliminary electrical ceiling is the minimum of device target, active charger-port output, and cable power rating. Protocol mismatches and real-world conditions can only reduce or reshape that result.
Display payload
The planner multiplies active width × height × refresh × bits per pixel × display count, applies the selected chroma factor, then adds a user-selected timing overhead estimate. It compares that estimate with known usable DP payload rates. It is not an exact CVT timing generator or a DSC model.
Multi-port power
The planner screens per-port targets against a total budget, then shows a proportional scenario when demand exceeds that budget. Actual chargers may use fixed or dynamic allocation rules; the exact manufacturer table remains authoritative for the chosen port combination.
Corrections
Standards, products, and operating systems change. Report an error with the page URL, affected result, exact product model, and a public source to canghun13@naver.com.
Last reviewed: August 11, 2026.