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