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The Raspberry PI 4 Model B features a significantly faster processor than the 3B+, rich multimedia, multiple memory versions and better connectivity, integrated PCIe links to USB 2 and USB 3 ports and a native-connected Ethernet controller, a greatly improved GPU feature set and faster input/output.
|CPU||ARM Cortex-A72 Quad-core 1.5GHz|
|GPU||Broadcom VideoCore IV@500MHz|
|USB||2x USB2.0 + 2x USB3.0|
|Dimension||85 x 56 x 17 mm|
Although the CM4 layout appears simple, it requires no specific I/O consideration.
The CM4 is likely to be used by serious users who will incorporate it as a part of a custom system and enclosure. These users will most likely want to source their own heatsinks to match their specific needs. Hence, it may not be worthwhile for RPT to design a heatsink themselves, especially for prototypes and amateur/hobbyist users, as the market may not be large enough. While a third-party may produce one, it is still uncertain if the demand is sufficient for such a product.
Looks like its meant to be set via devicetree. A custom overlay needs to be made for this or the i2c-rtc overlay needs to be altered.
It’s unfortunate that when burning the SD card, one has to choose between the two versions of Pi Zero W. As I use both types of Pi hardware, it would be more convenient to have one SD card image that I can share. Currently, I need to have two separate images and label them accordingly.
The default packing list without selecting any accessories is as follows:
|Raspberry Pi 4 Model B||x1|