Found my notes on this one. The large fiber CPUs with smaller copper plates weigh .82oz each. The 20 sample size I did weighed 16.4 oz total and had 10 oz of #2 copper plates removed leaving 6.4 oz of fiber CPU. I did the math using current prices (which I won't post because they will be different when read) and found that there is about a 5% gain in separating the copper from the CPU. Unless I have thousands of them and nothing to do but chisel the heatsinks off, I'm just leaving them on.
This did include selling the copper separately.
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