Quick Answer
USB-C power delivery becomes a bottleneck when the dock's wattage falls below your laptop's draw under load, for example a 65W dock feeding a laptop that needs 90W or pulls more while gaming or editing. The result is slow charging or a draining battery. Avoid it with an 85W-to-100W dock matched to your laptop (around R1,800 to R3,500 at Evetech).
When Power Delivery Bottlenecks
The bottleneck appears when demand exceeds supply. A laptop shipping with a 90W or 100W charger, run hard while gaming or editing, can draw near or above that figure. A 65W dock cannot keep up, so the battery slowly drains even while plugged in. The fix is a dock whose power delivery matches or exceeds the laptop's charger wattage.
Matching Wattage To Workload
Light tasks like browsing draw little, so even a modest dock keeps the battery topped up. Heavy workloads, gaming, video editing, compiling, push the laptop toward its peak, which is where an underpowered dock falls behind. Check the charger wattage and buy a dock that meets it, choosing 100W-PD if you run demanding tasks.
When The Laptop Exceeds 100W
Some high-performance laptops draw more than 100W at full tilt, beyond any standard USB-C dock. In that case keep the original barrel charger connected alongside the dock for heavy sessions.
FAQ
When does USB-C power delivery bottleneck a laptop?
When the dock's wattage is below the laptop's draw under load, such as a 65W dock with a 90W laptop while gaming or editing. The battery then drains slowly even while plugged in.
How do I avoid a power delivery bottleneck?
Match or exceed your laptop's charger wattage with the dock. A 90W laptop needs an 85W-to-100W dock; choosing 100W-PD covers most laptops, including under heavy workloads.
What if my laptop needs more than 100W?
High-performance laptops can draw over 100W at full load, beyond standard USB-C docks. Keep the original barrel charger connected alongside the dock for demanding gaming or editing sessions.
power bottleneck by matching the dock's wattage to your laptop's charger, choosing a 100W-PD dock for heavy workloads. If the laptop draws over 100W, keep its barrel charger connected alongside the dock.