I've recently received two RaspberryPi model B boards (from Farnell and RS), and I see quite some differences between them. Picture here: http://18.104.22.168/RaspberryPi.jpg
What tricked me to look close to the boards was the fact that one of the boards has significant stability problems with the USB (LAN/Keyboard/Mouse). Let's call it board "B" for reference.
Note that the tests where ran with the same power adapter
(with 5V and 1,25A), bought from RS and it looks very good/stable.
These are some differences I've noted so far:
a) The TP1 and TP2 pins show 4.99 on load in board "A" and 4.89 on board "B" (remember same power adaptor)
b) The RAM is from SAMSUNG in "A" and HYNIX in "B"
c) There are some minor differences in prints on the PCB (look at the picture attached)
I'd like to have some feedback on how I can make the "B" run stable (please don't say power adapter), since I didn't wanted to return it.
Also if you have different boards please fell free to post a picture, to see if we start to make some sense out of these problems
Thank you all