A Nintendo csak kevés technikai adatot adott ki a Wii rendszerről, de néhány kulcsfontosságú adatot kiszivárogtatott a sajtó. A feltüntetett adatok NEM kaptak hivatalos megerősítést.
Processors:
CPU: PowerPC based "Broadway" processor, made with a 90 nm SOI CMOS process, reportedly† clocked at 729 MHz
GPU: ATI "Hollywood" GPU made with a 90 nm CMOS process, reportedly† clocked at 243 MHz
Memory:
88 MB main memory (24 MB "internal" 1T-SRAM integrated into graphics package, 64 MB "external" GDDR3 SDRAM)
3 MB GPU texture memory
Ports and peripheral capabilities:
Up to four Wii Remote controllers (connected wirelessly via Bluetooth)
Nintendo GameCube controller ports (4) (one can be used in conjunction with four Wii Remote units for five-player multiplayer capability)
Nintendo GameCube Memory Card ports (2)
SD memory card slot
USB 2.0 ports (2)
Sensor Bar port
Accessory port on bottom of Wii Remote
Mitsumi DWM-W004 WiFi 802.11b/g wireless module
Compatible with optional USB 2.0 to Ethernet LAN adaptor
Built-in content ratings systems:
BBFC, CERO, ESRB, OFLC, OFLC (NZ), PEGI, USK
Storage:
512 MB built-in NAND flash memory
Expansion available via SD card memory
Nintendo GameCube Memory Cards (for saving GameCube games only)
Slot-loading disc drive compatible with 8 cm Nintendo GameCube Game Disc and 12 cm Wii Optical Disc
Mask ROM by Macronix
Video:
Up to 480p (PAL/NTSC) or 576i (PAL/SECAM), standard 4:3 and 16:9 anamorphic widescreen
Component (including Progressive scan), RGB SCART (PAL only), S-Video (NTSC only), composite output, or D-Terminal
Audio:
Main: Stereo - Dolby Pro Logic II-capable
Controller: Built-in speaker
†Ezen órajelek egyikét sem erősítette meg a Nintendo, IBM, vagy ATI.