There will be two version of the Compute Module 3: CM3 with a 4GB eMMC, and CM3 Lite without eMMC, but SD card signal are available to the baseboard.

Apart from this difference, both modules shares the same specs:

SoC

Broadcom BCM2837 quad core Cortex A53 processor @ 1.2 GHz with Videocore IV GPU

System Memory

1GB LPDDR2

Storage

CM3 Lite – SD card signals through SO-DIMM connector

CM3 – 4GB eMMC flash

200-pin edge connector with:

48x GPIO

2x I2C, 2x SPI, 2x UART

2x SD/SDIO, 1x NAND interface (SMI)

1x HDMI 1.3a

1x USB 2.0 HOST/OTG

1x DPI (Parallel RGB Display)

1x 4-lane CSI Camera Interface (up to 1Gbps per lane), 1x 2-lane CSI Camera Interface (up to 1Gbps per lane)

1x 4-lane DSI Display Interface (up to 1Gbps per lane), 1x 2-lane DSI Display Interface (up to 1Gbps per lane)

Power Supply

VBAT (2.5V to 5.0V) for BCM2837 processor core, 3.3V for PHYs, UI and eMMC flash, 1.8V for PHYs, IO, and SDRAM, VDAC (2.8V typ.) for video composite DAC, GPIO0-27_VREF & GPIO28-45_VREF (1.8 to 3.3V) for the two GPIO banks.

Dimensions

67.6 x 31 mm; compliant with JEDEC MO-224 mechanical specification used in DDR2 SO-DIMM memory module

Temperature Range

-25 to +80 degrees Celsius

Compute Module 3 and 3 Lite are electrically & mechanically compatible with the original Raspberry Pi Compute Module (CM1), so ModBerry 500 / NPE X500 will gain exra performance.

Following differences explained in the datasheet:

“Apart from the CPU upgrade and increase in RAM the other significant hardware differences to be aware of are that CM3 has grown from 30mm to 31mm in height, the VBAT supply can now draw significantly more power under heavy CPU load, and the HDMI HPD N 1V8 (GPIO46 1V8 on CM1) and EMMC EN N 1V8 (GPIO47 1V8 on CM1) are now driven from an IO expander rather than the processor. If a designer of a CM1 product has a suitably specified VBAT, can accommodate the extra 1mm module height increase and has followed the design rules with respect to GPIO46 1V8 and GPIO47 1V8 then a CM3 should work fine in a board designed for a CM1.”

You can download official Data Sheet here: