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That’s a bit of a generalisation.
The majority Of post 5x86 era gold caps are considerably below double sided cap rate. Including most sun cpus.
Though I assume you refer to pr1998 chips like 486, and 8086.
The value of the cap plating on all CPUs adds to he value but it enough to be a headline. More a footnote.
Eg 1996 i386d cpus still go as 386/486 next to the original mid-80s chips. No gold cap. WE 486 CPUs go there as well.
The value is in the cpu. Not the gold cap. (YouTube tends to be way off on value).
A 1996 80x386 from intel on the 1.4um process has far larger internal makeup than, say, a 2004 IBM 40c60. Both have shiny gold caps and are almost the same size die. The intel being 1.4um vs the IBM at 65nm means the former has much larger everything vs the latter.
AMD currently is the last major company to make a ceramic socket 132 chip. It doesn’t qualify as a 386/486 with or without the cap. It’s on the 32nm process and goes as AMD Ceramic.
The bigger the process the larger the materials volume involved.
You will notice the 8086-486 price range clump together. Most being in the 350nm-6um range.
If you found a 4004 or 4040 it would push into custom quote range. Those being 10um process. Along with major inconsistencies in design of early IC microchips.
There’s very very very little gold in the gold caps.
Which is why I publicly laugh at get rich YouTube videos for processing the caps and not the CPUs! You skip the milling step with caps but you loose the majority of the value, housed in the ceramic! And go through nearly as much trouble!
That said it’s, again, the CPUs that hold the value. Pop a cap off and you’ll get a deduction of sorts on your chip but nothing major. It’s strongly frowned upon because boardsort is (as in person reviews point out) a high volume fast pace business. Eyeballing materials is the norm.
And no, you’re not going to “get an ounce of gold from an ounce of gold caps”.
Cheers!
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