i believe there was an answer to that question in one recent post. a link to tinyurl.com? something like .0016 lb. au content from a seventy pound computer. if you are looking into recycling gold from e-waste, and cant readily find old 286, 386, 486 cpus, i would say look into gold plated connectors. IE: printer cables, rca cables. these items are readily reverse plated. good luck and happy hunting.