Computer memory chips are actually small circuit boards that contain a group of memory chips available in 32-bit or 64-bit bus widths called a SIMM or Single In-Line Memory Module containing megabyte (MB) or gigabyte (GB) chips.
To get it, sign up for either VPak, which includes Dashboard and unlimited Mobile Web, or go for the A La Carte option, which charges per megabyte sent and received and does not include Mobile Web.
Some other features on the Xbox include a 5x DVD drive that allows movie playback, support for broadband connectivity, an 8 megabyte removable memory card and HDTV support.
Broadband connections provide high data transfer speeds up to 1 Mbps (megabyte per second), about 50 times the speed of dial-up.
To break that down into simpler terms, one megabyte of space will hold one million bytes or characters.