This is an introduction to my custom-designed computer cluster based on the Raspberry Pi. More information can be found at http://likemagicappears.com/projects/raspberry-pi-cluster/. source

Raspberry Pi Compute Module 3 (CM3) concentrates on consumer products

Sort of announced in July 2016, the new Raspberry Pi Compute Module 3 (CM3) is believed to arrive at the market fastly. Last Oct PC equipment company NEC previously announced a new spread of professional P and V Series large format displays that faultlessly include the RPi CM3 module. The new module, obtainable in two flavors – CM3 and CM3L (lite) – will complement the CM1 module released some years ago.

Specifications for the CM1, CM3 and CM3L SODIMM modules appear in the data sheet readily available on the RPi web page
https://www.raspberrypi.org/documentation/hardware/computemodule/RPI-CM-DATASHEET-V1_0.pdf
. Where the CM1 was based on a BCM2835 CPU (as used on the original RPi and RPi B+ models), the CM3 includes a quad-core 1.2 GHz BCM2837 CPU, like the RPi 3. It includes 1 GB of LPDDR2 RAM and 4 GB eMMC Flash. The ‘L’ version is a CM3 without eMMC Flash, making it possible for the end user to add his/her personal SD/eMMC product. The pinout of the CM1 and CM3 modules are identical but the CM3 module is one millimeter higher (31 millimeters).

Pricing

The buying price of the new modules is not known yet, but because a CM1 retails at about £20, a equivalent price may be estimated for the CM3.

According to : https://www.elektormagazine.com/news/raspberry-pi-compute-module-3-cm3-to-hit-the-market-soon

Technical Specs

The CM3 is founded on the Raspberry Pi 3 hardware and is created for industrial use to provide a cost efficient way for consumers to make tailored products based upon the Pi hardware and software system. The Compute Module products is more compact and has less attributes and ports than a regular Raspberry Pi, allowing it to be well suited for Internet of Things (IoT) products.

“The module works with a standard DDR2 SODIMM form factor, sockets for which are made by a few manufacturers, are conveniently available in the market, and also are cost-effective,” Raspberry Pi COO and hardware lead James Adams said in a post.

You will find 2 versions of the CM3. Underneath are the specs for both:

Standard Version:

BCM2837 chip at up to 1.2Gigahertz
1GB RAM
4GB of on-module eMMC flash

Lite Variant:

BCM2837 processor at up to 1.2GHz
1GB RAM
Sdcard interface on Module pins hence an end user can connect this up to an eMMC or Sdcard that they select

Both versions can be slotted into a newly released Compute Module IO Board V3 (CMIO3) which helps you to do the following:

Offers essential power to the CM3
Will allow you to program the CM3 Standard’s flash memory or to make use of an Sdcard on the Lite version.
Access the processor interfaces in a a little more friendly fashion (pin headers and flexi connectors, just like the Pi)
Provides the essential HDMI and USB connectors allowing you to have an whole system that can boot Raspbian (or the OS that you choose).

“This board supplies both a starting template for those who want to design with the Compute Module, and a quick way to start experimenting with the hardware, and building and testing a system, before you go to the expense of fabricating a tailor made board,” Adam said.

The older Compute Module model will continue to be provided, for individuals that have no need for the CM3’s performance boost. In line with the Raspberry Pi official magazine The MagPi:

“With a couple of caveats, the CM3 can be utilized a drop-in alternative to the CM1 since they are pin compatible; the CM3 is 1mm taller, having said that, while the CPU can pull far more current from the VBAT power line and will eventually deliver a whole lot more heat under heavy load.”