New Raspberry Pi: Compute Module 4S

Strange times beget strange things.

And that's an apt description of the new Raspberry Pi Compute Module 4S:

Raspberry Pi Compute Module 3+ to 4S Differences

The above chart is from Revolution Pi's page announcing the RevPi S and SE, which are updates to their popular CM3+-based industrial DIN rail computers.

They've been working on a RevPi 4 built around the Compute Module 4 that was announced in 2020, but after many delays, it seems they brokered a deal with Raspberry Pi to use a cut down Compute Module 4S, which eschews not features like gigabit Ethernet and PCI Express, as well as the entire form factor of the CM4.

The CM4S mashes a BCM2711 SoC into the Compute Module 1, 3, and 3+ form factor—which was used for years until the switch to 2x 100-pin board-to-board connectors on the CM4 (pictured on the left):

Compute Module 4 and CM3+ edge connectors and board to board SO-DIMM 200-pin

I'm guessing the reason this board was produced is because Raspberry Pi can't secure enough of the older 40nm process SoCs that powered older-generation Pis.

Instead of leaving industrial customers who designed around the old SO-DIMM form factor out to dry, they updated the design to use the 28nm BCM2711, which does seem to be available in quantities surpassing 500,000 per month currently.

So far, I don't know if the CM4S will be made available to anyone outside of Revolution Pi, though I've posted on the forum asking as much: New Compute Module 4S? [Raspberry Pi Forums].

While the CM3+ and earlier Compute Module models weren't quite as popular as the CM4 is today (owing to their slower SoCs and weaker IO), they are in a lot of embedded devices. I'm sure many customers would love a drop-in upgrade to the BCM2711, with it's doubled CPU performance, faster GPU, and doubled memory bandwidth.

For a little more detail on the CM4S, check out my latest YouTube video, embedded below:



could it be that the forum post is locked ?

I thought that there were new variants of the cm4 because of the "s". Why didn't they give a different letter???