CPU: IBM PowerPC 750CL "Broadway" (custom) @ 729 MHz
GFX: ATI "Hollywood" @ 243 MHz
SND: Macronix 16-bit DSP
MEM: 24 MB System / 64 MB Video
RES: 480i/p (576i on PAL)
OS: IOS Firmware 62 (UI: System Menu v4.3)
The CPU and GPU are reportedly a direct evolution from GameCube's Gekko CPU and Flipper GPU, both running 50% faster.
The DSP is the same found in the GameCube but running at a different clock, maybe 50% faster, at 162 MHz…
When in GameCube compatibility mode, the system runs a modified version of IOS: the MIOS.