Perhaps I misspoke. I responded to boards in general and not just mother boards. When I think about printed circuit boards, I think in the scope of all boards. The most common PCB's are from consumer products and not necessarily computers. To be fair, the topics name is "board colors". There are boards in almost every modern appliance. Anything digital, clocks, stoves, microwaves, refrigerators, DVD players, cable box, modems and routers, TV's, and on and on. Brown and white boards are more common. There are many of these PCB's that yield more PM's by weight than computers. Just because there's no visible gold, people tend to overlook them. This forum has been a great resource at identifying some of the more exotic boards with greater PM value but still more are still waiting to be brought to our scrutiny. It is my opinion that the most valuable metal in all PCB's is by far copper. The copper value of all printed circuit boards far outweighs the PM value. We concentrate our efforts to recovering drips and drabs of gold while letting the greater value either sit or be carted off to places unknown. I feel that the promotion of metal recovery in general should be stressed more instead of just precious metal. Since this is a precious metal forum, the main topic will always be about the gold and that's fine but do keep in mind that the copper in most PCB's (even motherboards) is worth more than gold by weight in boards.