The upstream USB-C port is the one that charges your laptop at 65W on the Dell S2725QC, and the downstream USB-C port will not. Dell gives the monitor two USB-C ports with very different jobs, and plugging your laptop into the wrong one is the usual reason a screen lights up while the battery keeps draining.
Quick Answer
Connect the laptop to the upstream USB-C port on the Dell S2725QC. That port carries video over DisplayPort 1.4 Alt Mode and delivers up to 65W of charging, while the separate downstream USB-C port supplies only up to 15W. Evetech sells the 27 inch Dell S2725QC, a 4K 120Hz monitor, at R7,799.
🔌 Upstream versus downstream: what each port does
The upstream port is the link to your computer. One cable from the laptop brings picture, USB data and power, and the monitor sends up to 65W back along the same wire. The downstream USB-C port is for devices you attach to the monitor, such as a phone, a drive or a headset, and it supplies up to 15W, enough to top up a phone but nowhere near enough for a laptop.
The 65W figure is the most the port can give. A laptop that draws more than that while working hard will charge slowly or hold steady rather than gain percent.
💻 Does your laptop qualify?
Three checks decide whether the one-cable setup works. The laptop's USB-C port must support video output through DisplayPort Alt Mode, not just data and charging. It must accept charging over USB-C. And the real power need should sit at or under 65W, which suits most thin office laptops, while many gaming laptops draw well above it and need their own charger.
Look for a small DisplayPort or lightning-bolt icon beside the port, or the specification sheet. A port marked with only a battery or USB symbol may carry data and charge but no picture.
🧵 The cable is part of the answer
A cable that works for charging a phone may fail here. For a full 65W you need a USB-C cable that carries video and is rated for the power; at that level the current is above 3 amps, so a cable with an electronic marker for 5 amps is the safe choice. A loose or underrated cable gives symptoms like a screen that blinks, a charge that drops, or a "slow charging" message.
If you need a replacement, the cable solutions shelf is the place to look. Buy a cable that lists both video and power ratings in its name, and keep the length short for a stable signal on a 4K 120Hz link.
🏠 Why one cable suits a home-office desk
In a shared flat or a Johannesburg home office where the desk is also the dining table, a single cable that charges the laptop and drives the monitor makes packing up a ten-second job. The S2725QC also has dual HDMI 2.1 inputs and USB-A ports for a console or a second computer, alongside its 4K resolution and AMD FreeSync Premium support.
For wider browsing, look at the office monitors shelf, or the monitor best sellers to see what else people buy for the same job.
Frequently Asked Questions
Which USB-C port on the Dell S2725QC charges a laptop at 65W?
The upstream USB-C port. It carries video with DisplayPort 1.4 Alt Mode and supplies up to 65W of power to the laptop.
What does the downstream USB-C port do?
It connects accessories to the monitor and supplies up to 15W. It is not meant for charging a laptop.
Why does my laptop not charge through the monitor?
Common causes are a port without video or charging support, a cable not rated for 65W, or a laptop that needs more than 65W under load. Test with a certified cable first.
How much is the Dell S2725QC at Evetech?
Evetech sells the 27 inch Dell S2725QC 4K 120Hz monitor at R7,799.
Can I use this monitor with a console?
Yes. It has dual HDMI 2.1 inputs, and the USB-C link stays free for a laptop.
Ready to run your desk from one cable?
Browse Evetech's monitors and USB-C cables and pair a charging monitor with a laptop that supports video over USB-C. It keeps the desk clear and the battery topped up.