Kensington SD4800P USB-C dock for three monitors

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The Kensington SD4800P is a Windows 10 USB-C dock that supports up to three monitors, 60W USB PD and a massive 135W charger.

Kensington is a PC/Mac accessory maker, and its range of docks are impressive. Normally these work with Mac or PC but the SD4800P uses tech only found in the Windows supports Multi-Stream Transport (MST). It does not require drivers or display software.

Why a dock?

Most modern PC laptops now come with USB-C 3.1 Gen 1 (5Gbps), some have USB-C 3.1 Gen 2 (10Gbps), and more recent ones have Thunderbolt 3 (40Gbps).

This interface transmits data, audio, video (called altDP) and power (called Power Delivery) in the one cable. As it is USB-C, the cable is 1m instead of the usual .5m passive Thunderbolt cable.

A dock remains on your desk allowing monitors, mice, keyboards, phone charge cables and flash drives to remain connected when you remove the laptop.

Review: Kensington SD4800P USB-C dock


Website here

Its unique selling proposition is that it supports up to three monitors – and it can. But there are a few caveats – no deal breakers.

  • Single monitor: 3840 x 2160 @ 30Hz (it supports a single 4K@60Hz in 4-lane mode) off the HDMI 2.0 port
  • Dual monitors: 1920 x 1080 @ 60Hz (it supports dual UW 2560 x 1440 or 4K@30Hz and one UW in 4-lane mode) using the dual DisplayPorts
  • Triple monitors: 1600 x 900 (it supports three 1080p@60Hzx in 4-lane mode)

You do need to be careful as most Intel CPU/Graphics chipsets only support three monitors, and some cannot sustain bandwidth. That may mean you need to close the lid on a laptop.

Four-lane versus two-lane – video boost

There is a switch under the dock that allows you to select 2 or 4 lane. As best as we can figure out 2-lane is it can take bandwidth from the Gigabit Ethernet Port to 100Mbps and lower USB-A 3.1 speeds from 5GBps to USB 2.0 480Mbps. As all the dock ports share the source bandwidth, this makes sense.

In practice, we experienced no issues driving 2 x 1080p@60Hz monitors off the dual DisplayPort 1.3 in 2-lane mode.


The power brock supplies 20V/6.75A (135) as follows

  • USB-C 60W upstream PD 3.0 (50-20V/3A) which supports many ultralight and laptops
  • Four rear USB-A 3.0 5Gbps ports 5V/.9A
  • One front USB-A 3.1 Gen 2 10Gbps port 5V/2.4A
  • One front USB-C 3.1 Gen 2 10Gbps port 5V/3A


We tested using a Huawei MateX Pro that has both a Thunderbolt 3 and a USB-C Gen 2 port.

We tested using an external USB-C SATA6 SSD and a variety of USB-A devices. Throughput was as good as using these on a Thunderbolt 3 dock – there were no bottlenecks.

It is impressive to have 5V/3A to also power external devices like a portable hard disk, and a video capture dongle.

Ethernet was rock solid at 996Mbps and in 4-lane mode at 100Mbps.

The 3.5mm combo audio port offers 16-bit/48,000Hz DVD quality analogue sound.


It also can be VESA mounted to the read of a monitor.

Who is it for?

Its best use is to drive two 1080p monitors as well as the USB-C equipped Windows laptop screen. Or in 4-lane mode a couple of ultra-wide 2160 x 1600 21:9 monitors.

It has stacks of power too and sleep charging ports.

GadgetGuy’s take

We review so many docks that these days it is more a matter of do they work as promised. Kensington always do!

Windows 10 USB-C laptop, add dock, monitors, and that is it. Simple. It is not for Mac so if you read any so-called reviews for Mac ignore them – fake.

GadgetGuy has covered other Kensington docks here


This is new, and Kensington has no Australian pricing. US pricing is $219.99 so expect about $350-400 here.

Value for money
Ease of Use
Reader Rating0 Votes
Best for two monitors and a laptop display
Plenty of power with 130W adapter and 60W upstream PD 3.0
Lot of USB-A ports
4-lane video boost switch if you need it