RaspberryPi Boards

Hardware versions/revisions
Several different boards have been found probably from different assembly lines, and the following table tries to help you identify your board for better troubleshooting. These differences are been debated on raspberrypi.org on this thread

For what we can see for model B boards there are mainly two versions that differ on the type RAM used, Samsung (S) and Hynix (H).

Note: For Board ver. we used:  (ex.: BS1218 is "Model B, Samsung RAM, 18th week of 2012")

Model A:

Model B: