Waveshare Compute Module 3+/8GB Raspberry Pi 3 Model B+ BCM2837 Processor and 1GB RAM in a Flexible Form Factor with 8GB eMMC Flash CM3+/8GB

The CM3+/8GB Compute Module contains the guts of a Raspberry Pi 3 Model B+ (the BCM2837 processor and 1GB RAM) as well as an 8GB eMMC Flash device (which is the equivalent of the SD card in the Pi).
This is all integrated onto a small (67.6mm × 31mm) board that fits into a standard DDR2 SODIMM connector. The Flash memory is connected directly to the processor on the board, but the remaining processor interfaces are available to the user via the connector pins.
You get the full flexibility of the BCM2837 SoC (which means that many more GPIOs and interfaces are available than with a standard Raspberry Pi), and designing the Module into a custom system should be relatively straightforward because the Pi Foundation has put all the tricky bits onto the Module itself.
Broadcom BCM2837B0:Cortex-A53 (ARMv8) 64-bit SoC @ 1.2GHz 200PIN SODIMM connector (35U hard gold plating I/O pins)
Compared to CM1, the CM3+ supports more OS, like Windows 10 (the free IOT-specific version from Microsoft)