What is a gpu pad?
If it is a thermal pad, it may or may not have minute amounts of silver, if it is high end.
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I've always called them pinless pads. Sorry about the misinformation. Most new cpu chips. Like i3 i5 i7 just the green bottom chips without the gold pins
If the CPU's are not old and collectable, I will remove the heat sink caps and throw them in with all the other plated parts, fingers, phone boards, etc.
There is not much gold plating on them, but no need to just trash them, IMHO.
Oh I'm sorry I didn't even see that I put gpu in the original posts. Yes cpu chips with the copper heat sink. Yes sometimes on heat sink they have g9ld plating. I'm talking about the gold 9n the bottom green fiberglass part. It's real thin plating but I have close to 1000 of them just sitting. Wasn't sure if simple soak in a.p would do the trick