From cube supplies like modern PCs, and old bricks, no. From server PSUs; only if you have the patience to clean them. These will usually have enough metals to strip to a metals scrap value worth it to those who wish to. Rack PSUs and Mega Cubes. Yes. These have pounds of fins for cooling usually a high grade aluminium, sometimes red brass or copper. Removing the fins, the transformer (or pair) and the largest capacitors will net you a peripheral grade board and metals as well. The inside cases are almost always aluminium and the outside cases are usually a compression moulded carbon. Easy to identify. They’re 2-5 times larger AND weigh 5 lbs or more; usually 10-15 lbs.
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