KKSB Raspberry Pi 4 Aluminum Case Review – Benchmarks at Stock Clock and Overclocked to 2.0 GHz

KKSB is a Swedish company designing and manufacturing metallic products for various open-hardware products such as single board computers including Raspberry Pi, Arduino, ODROID, Orange Pi and others, as well as mobile phone and tablet stands, and they also have a mini-ITX case planned for March.

The company approached CNX Software to review their latest Raspberry Pi 4 case, and I was interested to find out how it would handle cooling.

KKSB Raspberry Pi 4 Case Aluminum Unboxing

So I recently received the enclosure in a mostly white package.KKSB Package
The case comes in two parts as well as a thermal pad for the processor, mounting screws, rubber pads, and two plastic bits for the LED.

KKSB Raspberry Pi 4 Case Aluminum 720
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Aluminum Case Assembly

First, peel over the plastic film on one side of the thermal pad, and place it on the extrusion for the processor on the top part of the enclosure.

Raspberry Pi 4 Thermal Pad EnclosureRemove the second plastic film from the thermal pad, and place the Raspberry Pi 4 on top so that the processor comes in contact with the thermal pad. Place the bottom part on top, and tighten it with the four screws.

KKSB RPi 4 Case AssemblyYou’ll notice a small opening on the side for a ribbon cable for people wanting to make use of the GPIOs. There are also two holes for wall-mounting and three more cutout lines that must be to let the WiFi signals go through (I can confirm WiFi is still working).

We just need to stick the four rubber pads on the bottom of the case, and glue the plastic bits for the LED to complete assembly.

KKSB Raspberry Pi 4 Metal Enclosure
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There’s another opening on top of the MicroSD card and LEDs that should be for the MIPI CSI camera and/or the MIPI DSI display.Raspberry Pi 4 Metal Case

Upgrading Raspberry Pi 4 OS and Firmware

Before testing, I updated Raspbian and firmware to the latest version with apt:

Note that I had to make some changes first due to issues with rpi-monitor hosting server.

Here are the various versions of Linux kernel, Raspbian operating system, and ThreadX and VLI firmware installed:

Let’s access RPI-Monitor in our web browser and wait until the CPU temperature stabilizes. Note the room temperature is around 28°C.

Raspberry Pi 4 Aluminum Case Idle Temperature
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The left of the chart is idle temperature after several hours after the update, and once we reboot and the new firmware takes effect we can see the temperature drop.

Benchmarking Raspberry Pi 4 Clocked at 2.0 GHz

One thing I forgot was that one of the last tests I did with Raspberry Pi 4 was to overclock it to 2.0 GHz, so it was still in this state when I first tested it. No problem, let’s try one of the worst cases first (now it even support overclocking up to 2.1 GHz).

I then installed & started to run the latest version of sbc-bench script:

But stopped waiting a bit longer for the temperature to stabilize at around 57°C. Let’s start the benchmark again:

If we look at the log we can see the 7-zip multi-threaded test crashed once due to running out of memory on my 1GB RAM RPi 4. The throttling bit is set but it must have been a very short time since it does not show in the frequencies displayed in the log:

The chart also shows the temperature peaked at around 80°C.

Raspberry Pi 4 2-GHz CPU Temperature KKSB Case
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Benchmarking Raspberry Pi 4 at stock 1.5 GHz clock

Let’s disable overclocking reboot, and wait for CPU temperature to stabilize (around 51C this time), before restarting sbc-bench.sh:

Not throttling detected at all this time, and the temperature chart looks good with the CPU temperature never exceeding 66°C.

Raspberry Pi 4 Fanless Metal Case Temperature
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KKSB Raspberry Pi 4 aluminum case does a good job of cooling the board even when overclocked. WiFi still works, and the case provides openings for GPIO’s and MIPI CSI/DSI modules, as well as mounting holes. The company sells it for 31.92 Euros on their website. If you think that’s a bit too expensive, the KKSB Raspberry Pi 4 case black/silver is also made of metal, sells for only 15.12 Euros but lacks the extrusion for cooling the processor, so you’d have to add your own heatsink and cooling will not be as efficient.

You’ll also find cheap Raspberry Pi 4 aluminum cases on eBay, but note that many of them come with a fan, lack the extrusion for cooling the processor, the openings for GPIO and MIPI cables, and may interfere with WiFi. Just make sure to double-check the features that are important to you.

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