This is the way I tell. For the most part, if the board has 12 flash chips, then it is a 256 MB board. If it has 8 flash chips, then it's 128MB. UNLESS they use Spansion brand flash chips, these are higher density chips, so they only require 8 for the 256MB capacity. For the record, the capacity is determined by looking at the flash chips on the right side of the board, when looking at the board with the twin connectors positioned as the bottom of the board. The ones one the left side will always be 4 chips with a capacity of 64MB. Then the ones on the right will either be 4 (128MB unless they are spansion brand, then it's 256) or 8 either AMD or intel chips which will give you a 256MB capacity.