I have a 2011 Raspberry Pi, and after much searching on the internet I cannot seem to find the specs for it. Does anyone have any idea what the main difference between a prototype 2011 Raspberry Pi and a model B Raspberry Pi is?
http://elinux.org/RPi_HardwareHistory lists the revisions of the model B. You can tell which production model of the B you have by counting the number of holes.
No holes - early model B Two holes - later model B Four holes - B+
The Raspberry model B (The first one) had only 256 MB of ram instead 512, but the same processor as the second, and it was without mounting holes.