By type · Corded bench format
Desktop adapters: the format that holds full output.
A detachable AC cord, a body with room for a heatsink, and four to eight ports. Desktop-format supplies exist because past roughly 100W a plug-in brick runs out of surface area — and because a fixed workstation would rather hide the power supply than hang it off the wall.
The three things a cord changes
Thermals. A desktop unit has volume. More internal space means a larger transformer, bigger output capacitors and often a metal chassis acting as a heatsink, so the unit holds its rated output for hours rather than for a burst. That is the real distinction between formats: not peak watts, but sustained watts.
Placement. The supply goes behind the monitor or under the desk while a standard IEC cord runs to the outlet. Most units use the two-pin figure-eight C7 inlet or the three-pin C13 found on desktop PCs, both of which are cheap to replace in a longer or shorter length. Nothing hangs off the wall, nothing blocks the second socket, and the whole thing stops being a mechanical stress on the receptacle.
Port budget. With room inside for more output stages, four to eight ports become practical, and total wattage climbs to a level where the ports do not have to fight — the arithmetic is on the 4-port page and the 6-port page.
Desktop classes by total output
| Total | Typical ports | Runs comfortably | Notes |
|---|---|---|---|
| 100W | 3× C, 1× A | One ultrabook plus a phone and earbuds | The entry point; still capped by PD 3.0's 20V rail |
| 140W | 3× C, 1× A | A 16″ laptop at full speed plus accessories | Needs PD 3.1 and a 5A e-marked cable to reach 140W |
| 200W | 4× C, 2× A | Two laptops without either throttling | The point where a second high-draw device stops being a compromise |
| 240W | 3–4× C, 1× A | A 140W laptop plus a 100W second machine | The current ceiling of USB-C PD 3.1 at 48V |
Match the total to your 100W, 140W or 240W requirement, then check the cable spec — above 100W the cable, not the adapter, is usually what silently caps you.
Desktop units worth buying
- 240W
SmallRig 240W 4-Port PD
The high-water mark: PD 3.1 throughout, 140W available on port one with three devices attached.
- Output
- 240W shared
- Ports
- 3× C, 1× A
- Standard
- PD 3.1
- 100W
UGREEN Nexode 100W 4-Port
The desk standard: a laptop at 65–70W while three accessories share what is left.
- Output
- 100W shared
- Ports
- 3× C, 1× A
- Form
- Corded desktop
- 108W
Satechi 108W Desktop Charger
Aluminium-bodied bench unit built to sit in view rather than hide under the desk.
- Output
- 108W-class
- Ports
- 3× C, 1× A
- Form
- Corded desktop
If the unit will travel more than once a month, the trade runs the other way — see plug-in wall adapters and the head-to-head at wall versus desktop. For the rest of the desk, including cable routing and monitor pass-through, the desk charging guide and our desk charger picks cover the layout. Back to all adapter types.
FAQ
Is a desktop charger better than a wall charger at the same wattage?
For sustained load, yes. Both hit the rated number, but the corded unit has the mass and surface area to hold it for hours without thermal rollback. For portability the wall unit wins outright — it is a placement decision, not a quality one.
Do desktop chargers have fans?
Almost none at 240W and below; GaN switching is efficient enough that passive cooling handles it. Anything that does hum is either a fan or coil whine, and coil whine under load is common and harmless even though it sounds alarming.
Can I leave a desktop adapter plugged in permanently?
Yes. Idle draw on a certified modern unit is a fraction of a watt, and there is no charge cycle to manage because the device controls its own battery. Give it 5cm of clearance so convection can work.
What is the difference between a C7 and a C13 inlet?
C7 is the two-pin figure-eight connector used by most compact desktop supplies; C13 is the three-pin kettle-style inlet from desktop PCs and includes an earth pin. They are not interchangeable, so check the socket shape before ordering a replacement lead.