While we're at it, let's see what changed on the updated non-HD Kindle Fire's motherboard:

Samsung KLMAG2FEJA 8 GB Flash Memory

Elpida B8164B3PF-1D-F 8 Gb (1 GB) DDR2 RAM

Texas Instruments 603B107 Fully Integrated Power Management with Switch Mode Charger

Texas Instruments LVDS83B Power Controller

Texas Instruments WL1270B WLAN Solution

In short: the non-HD version now has twice the RAM, but is largely unchanged—processor included.