USB 2.0 Ports Memory Card Slots Wireless Capability PS2 Game Compatibility 60 gb $499 4x Yes Yes Full 80 gb $499 4x Yes Yes Partial 40 gb $399 2x No Yes No 20 gb 4x No No Full
Here's a complicated one by wired.com.
Each of the (4) ps3 models share the following capabilities:
- Cell Broadband Engine
- 256MB XDR Main RAM 256MB GDDR3 VRAM
- 2.5" Serial ATA (User Replaceable)
- Ethernet (10BASE-T, 100BASE-TX, 1000BASE-T
Bluetooth 2.0 (EDR)
Wireless Controller Bluetooth (up to 7)
- AV Output
- Screen size: 480i, 480p, 720p, 1080i, 1080p
HDMI**: HDMI out - (x1 / HDMI)
Analog: AV MULTI OUT x 1
Digital audio: DIGITAL OUT (OPTICAL) x 1
Blu-ray/DVD/CD DRIVE "read only"
[Source: Sony PS3 Modding - Homebrew, Upgrades, Mods, and Hacks]