Electromagnetic radiation is highly dependent on impedance, source frequency, temperature and materials composition so yes as far as PMs are concerned there is a VERY specific socket standard.
And while I don't doubt i series boards return even less metals, let me be kind of a devil's advocate here... SIPI has been taken on aggressively by other nationwide companies and let's have a moment of honesty here...I'm not real likely to believe anything SIPI says as complete truth because it's in their business interests to buy as low as possible. The i series boards could be filled with electrolytics and guess what there's two flatpacks (particularly the northbridge and two BGAs on there that tell me the board will never be "worthless". THat is excluding a land grid array with an engineering standard for it's composition and electocoatings. Even if grinding and refining cost lets say 60 cents on the pound (which it does not in a large operation). you will never ever lose money on a motherboard unless your competition is outbuying you. I also want to point out that the board has 6 to 11 layers of copper trace accounting for up to 30% of the overall "bare board" weight, do the math on that and even if you had to trash every part of the motherboard it's still going to have value.
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