According to sketches from information shared by SuperDae, there's 8GB of DDR3 memory, along with a small amount of flash memory for system tasks. The Durango's optical disc drive is 50GB in size, while, as mentioned, there's a 500GB hard drive, with read speeds of up to 50 MB/sec.
If you've got a 3D TV set, the Durango is capable—if developers want to support it—of delivering stereo 3D content in 1080p.
Those reliant on wi-fi, and who were forced to pay for Microsoft's costly external adapter with the original Xbox 360, will be happy to know that the Durango ships with built-in wi-fi (though there's still an ethernet port for wired connections).
In terms of audio, the retail Durango will output via either HDMI or S/PDIF (optical) connections, and can support up to 7.1 channels.