The key marking of interest on the A4 processor package is K4X2G643GE. This is identical to the marking found on the iPad and 4th Generation iPod Touch, but different from the iPhone 4 processor.

The Apple TV has 256 MB RAM, the same as the iPad and 4th Gen iPod Touch. We weren't expecting Apple to bump up the RAM, but it's a bit of a relief for app developers that the amount hasn't been reduced.

The rest of the contenders:

Apple 343S0479 1005 005BB

M430 F2350 TI E03K C0GP G4 (16-bit microcontroller)

SMSC 8710A-EZK B1023-A2 (10/100 Ethernet Transceiver)

TXC MUGT 27.000

TXCPCUM3 50.000