mainframes and other stuff

William Donzelli wdonzelli at
Tue Nov 25 00:18:11 CST 2014

Oops, I am a bit too tired, and something was bugging me about your

PPros have more than a third of a gram - they are closer to a gram per unit.


On Tue, Nov 25, 2014 at 1:08 AM, William Donzelli <wdonzelli at> wrote:
>> Let's say that a Pentium Pro has a third of a gram; a troy ounce is
>> 31.1 grams; so 94 Pentium Pro to the troy ounce; 4.5 pounds is about
>> 65 troy ounces; so 6,182 Pentium Pro might have that much gold.
> There are 12 troy ounces to the pound, not 16.
> Anyway, yes, you are talking about something like 4800 PPros
> equivalent. Now compare the plated surface areas of a PPro compared to
> a number of the pins on the backplane - you will find that a gold
> plate area on a PPro (mind you, there is a fair amount under the
> cover, too) equates to a surprisingly small amount of old IBM
> backplane pins. Remember, the pins are long, and plated on four sides
> - and probably had a thicker plate that on PPros.
> And yes, the 75 was a really huge machine. Gold on the backplanes,
> gold on the connectors (early Bus&Tags have a very heavy plate), gold
> in transistors. I would not be surprised if there was gold in the lamp
> sockets.
> --
> Will

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