I think NobleMetalWorks touched up on that subject once or twice. If I remember correctly, about the only way to really know the gold content in any item is to send a sample out to be assayed. But that winds up being a trust issue. I doubt you'll get an accurate number otherwise.
Just for the heck of it, I did a Google search for "how to assay gold in a motherboard" and wound up finding an Adobe .pdf file that might help you. Can't figure out how to link to it because once you click on it, it the browser automatically downloads it. But you can search for "eScrap Refiner's Gold Mining Guide" and after you download it take a look at it. Don't know how accurate it is though.
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