Raspberry Pi Compute Module 4S SO-DIMM module is powered by Broadcom BCM2711 SoC

The Raspberry Pi Compute Module 4S is an upcoming system-on-module based on the same Broadcom BCM2711 quad-core Cortex-A72 processor found in Raspberry Pi Compute Module 4, but using the same SO-DIMM connector as found in earlier Raspberry Pi Compute Module boards, instead of the new board-to-board connectors.

The Raspberry Pi Compute Module 4S is not launched yet, but we discovered it will be used on Revolution Pi S and SE series DIN-rail industrial computers via a tweet from Jeff Geerling and his post on Raspberry Pi forums.

Raspberry Pi Compute Module 4S

Apart from the faster processor and support for 4K video output, The Raspberry Pi Compute Module 4S is quite similar to the Raspberry Pi Compute Module 3+.

 
Raspberry Pi CM4S
SoC
Broadcom BCM2827B0 quad-core
Cortex-A53 processor @ 1.2 GHz with VideoCore IV GPU
Broadcom BCM2711 quad-core
Cortex-A72 processor @ 1.5 GHz with VideoCore VI GPU
System Memory
1GB LPDDR2
1GB LPDDR4
Storage
Up to 32GB
Display interfaces
1x HDMI 1.3a up to 1080p60
1x HDMI 2.0a up to 4Kp60
Ethernet
Up to 350 Mbps
Wireless (WiFi/Bt)
N/A
USB
USB 2.0 interface
PCIe
N/A
Dimensions
67.6 x 31 mm

Memory bandwidth might be a little better with the LPDDR4 memory too (TBC), but all the rest looks the same. The main advantage of the new Raspberry Pi CM4S module is compatibility with older SO-DIMM carrier board, and possibly better availability once it’s launched since older 40nm Broadcom processors like the BCM2837 are in short supply. Few people will use it for new designs as memory capacity appears to be limited to 1GB, and you’ll lose the PCIe interface, Gigabit Ethernet, plus support for optional WiFi and Bluetooth found in the Raspberry Pi CM4 module.

Revolution Pi provides further insights into the CM4S module:

As you know, the Revolution Pi family was not spared from the global chip shortage. In the last months we had to put many customers and people interested in RevPis off. This was mainly due to the supply of compute modules, which could not be delivered sufficiently.

The Raspberry Pi organization has therefore offered us a special alternative to the Compute Module 3+: The Compute Module 4S. This is a Compute Module in the form factor of the CM3+, on which the more powerful Arm Cortex-A72 processor of the CM4 is installed.

The following modules will be available as S/SE series: RevPi Core, RevPi Connect and RevPi Flat.

Customers upgrading from the CM3+ module will have to upgrade to a newer Linux 5.10 kernel.

The company says the first units of their S and SE series fitted with the RPi CM4S module will be shipped at the end of April as an alternative to their original orders. New orders should only become available in July 2022. Compute Modules 3 or 3+ based products will remain in their portfolio, and should start shipping again once the Raspberry Pi shortage issues are resolved.

 

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10 Comments
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tkaiser
tkaiser
7 months ago

> you’ll lose the PCIe interface

…as well as RGMII (‘native Gigabit Ethernet’) which results then in ‘up to 340 Mbit/s’ for an USB2 attached GbE controller (the ‘350MB/s’ above are clearly wrong).

> Customers upgrading from the CM3+ module will have to upgrade to a newer Linux 5.10 kernel.

More importantly they need an OS image with an updated primary OS and that’s ThreadX (euphemistically called ‘Firmware’ by RPi folks). Only updating the kernel won’t do the job.

kcg
kcg
7 months ago

This really sucks as many redesigned their appliances to move to new form factor without knowing there will be another module family coming basically compatible with cm3+. E.g. Turring Pi 2 etc.

Tuff Professional
Tuff Professional
7 months ago

Why is the Pi4 easier to produce than the Pi3? I know Pi4 uses more modern fab process, but it also uses more components or more expensive components right?

Is the old process being used for something else and eating RPi foundation capacities?

FreekieDeCakie
FreekieDeCakie
7 months ago

Old nodes are still in hot demand for products that don’t need anywhere near a leading edge node.

> Is the old process being used for something else

Yes.

Jeff Geerling
7 months ago

You can also fit more chips on a 28nm process wafer than the older 40nm, so there’s less demand currently plus you get more chips per die, a win-win for the BCM2711.

itchy n scratchy
itchy n scratchy
7 months ago

As long as we all pretend 28nm is state of the art…

Salvador Liébana
Salvador Liébana
7 months ago

This is a very good idea.

Tired_
Tired_
7 months ago

So, wait, can I buy one of these, toss it into one of those handheld consoles designed for the CM3, pop a CM4 compatible RetroPie on it, and off to the races?

tkaiser
tkaiser
7 months ago

Sure! You can buy a ‘Revolution Pi S/SE’, pull the CM4S out, throw the RevPi thing away and then waste your precious spare time with retro gaming the way you outlined.

Hint: nobody knows yet whether the CM4S will be sold separately or to whom and at which price.

Tired_
Tired_
7 months ago

I don’t see why you need to both be snarky and not answer my question. There’s literally no universe where these things don’t ever hit any secondary market ever. Your mouse has a scroll wheel, I encourage you to learn it’s functionality, the next time you feel like you want to be mean for no reason. HAND!

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