If you look at the older boards and compare them to the newer ones you can see that the plating is thinner. I think some people only go by the colour of the board because it is just much easier to distinguish between the boards age. Some go by the size of the cpu slot which would be a more accurate way of distinguishing the boards. If the amount of gold on cpu's is getting less then it only stands to reason that they will be cutting back whereever else they can as well. Memory hasn't decreased because there is a minimum plating required for it to stand up to removal and reslotting it in.
The problem is if your buyer is paying based on colour and you have a lot of the bronze/gold coloured boards which also can be just as old as the green ones and contain just as much pm's
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