The board with the CPU, GPU, RAM, and eMMC memory which detaches from the Mainboard. Depending on various commercial and technical considerations, new CPU boards may become available to upgrade existing Pyras.
Main Article: CPU
The OMAP5 (OMAP5432) is the SoC (System on Chip) of the Pyra. It's designed (and manufactured?) by Texas instruments. It resides on the CPU-Board, with these specifications:
- 2x ARM Cortex-A15 @ 1.5Ghz with NEON SIMD
- 2x ARM Cortex-M4
Main Article: GPU
- PowerVR SGX SGX544-MP2
- Vivante GC320 2D Accelerator
- HDMI Encoder: HDMI 1.4a, HDCP 1.4, and DVI 1.0 Compliant" 
Main Article: RAM
Dual Channel PC DDR3L 532MHz:
See also: Storage32GB of eMMC storage is also on the CPU-Board.