CPU Caps

[gmiller]

Hi all,

When the copper cover is removed from a Pentium4 CPU chip, the underside shows a yellow patch on some. Is this Au and if so how do I harvest it without using up a lot of chemicals dissolving the copper base.

Thanks in advance

Gary

 

[g_axelsson]

The name of the copper part is heat spreader. Yes, it's gold and the solder used is indium solder.

Try this search. https://www.google.com/search?q=site%3Agoldrefiningforum.com+p4+heatspreader&ie=utf-8&oe=utf-8&client=firefox-b#q=site:goldrefiningforum.com+p4+heat+spreader

Göran