I got some Apple G5 CPU's a while back.
I think they were over a Lb each & because they are a mix of Copper & Ali I got NZ$3 a Kg for the metal (US$2.40 each?)
The site that hosts the second pic is a used computer parts place. They say it weighs 3 & 1/2 Lb, probably closer than my guess.
Great site too, has the values of most 2nd hand parts. http://www.txcesssurplus.com
The bottom plate, that I thought was plated Copper, is actually a really really heavy Ali alloy. I cut it with a metal lopper & the Ali was hard, but soft. ie, It smeared, but didn't break or crack as I cut it.
And the boards covered in SMD capactors.....
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