Hardware

Wii hardware diagram

Wii specs

CPU

IBM 'Broadway' 90 nm based on IBM's Power architecture.
Runs at a speed of 729 MHz. Maximum Bandwidth is 1.9 GB/s.
Bus to main memory: 243 MHz, 64 bits (maximum bandwidth: 1.9 GB/s)
32 KB 8-way set-associative L1 instruction cache
32 KB 8-way set-associative L1 data cache (can set up 16-kilobyte data scratch pad)
Superscalar microprocessor with six execution units (floating-point unit, branching unit, system register unit, load/store unit, two integer units)
DMA unit (15-entry DMA request queue) used by 16-kilobyte data scratch pad
Write-gather buffer for writing graphics command lists to the graphics chip
Onboard 256-kilobyte 2-way set-associative L2 integrated cache
Two, 32-bit integer units (IU)
One floating point unit (FPU) (supports single precision (32-bit) and double precision (64-bit))
The FPU supports paired single floating point (FP/PS)
The FPU supports paired single multiply add (ps_madd). Most FP/PS instructions can be issued in each cycle and completed in three cycles.
Fixed-point to floating-point conversion can be performed at the same time as FPU register load and store, with no loss in performance.
The branch unit supports static branch prediction and dynamic branch prediction.
When an instruction is stalled on data, the next instruction can be issued and executed. All instructions maintain program logic and will complete in the correct program order.
Supports three L2 cache fetch modes: 32-Byte, 64-Byte, and 128-Byte.
Supports these bus pipeline depth levels: level 2, level 3, and level 4.

Reference Information: Broadway is upward compatible with Nintendo GameCube’s CPU (Gekko).

Broadway CPU version is 87102, Gekko is 83410. Source: http://forum.wiibrew.org/viewtopic.php?t=210
Information about its registers is available

Graphics

ATi 'Hollywood' processor
Runs at a speed of 243 MHz.

Includes:

Graphics processing unit (with 3 MB of eDRAM)
Audio DSP
I/O Bridge
24 MB of internal main memory
Internal main memory operates at 486 MHz.

Maximum bandwidth between Hollywood and internal main memory: 3.9 GB/s

Possible to locate a program here

Reference Information: Hollywood is similar to Nintendo GameCube’s Flipper and Splash components.

The Hollywood is a multi-chip package composed of two dies, named Vegas and Napa. Vegas is the GPU, and is also responsible for I/O functions, including memory access. Napa is the DSP, and includes 24 MiB of 1T RAM on the die. Vegas has direct access to 3 MiB of 1T RAM for use as a frame buffer and texture storage.

Qimonda HYB18HS1232 64 MiB GDDR3 graphics RAM

See Video Output for more information on the output connectors and the available video modes.

Memory

Elpida S1616AGTA 16-Mbit SDRAM
Samsung K9F4G08U0A 65-nm, 4-Gbit NAND flash
64 MB of GDDR3 (MEM2) as the external main memory. Can be accessed from the CPU and GPU with a bandwidth of 4GB/s and can also store programs in the MEM2.

Optical Drive

Supports single sided 4.7 GB and double sided 8.51 GB discs. Nintendo GameCube discs are also supported.

Wireless

Broadcom BCM4318 Wi-Fi transceiver
Broadcom BCM2045 Bluetooth device connected via USB

References