What category do these four boards fall into? Am I posting on the right topic? If not, what is it, and how do I get there?

that sound blaster is worth way way more as is the nit is for scrap. I seen them go for well over 100$

What about the other 2 boards?

Yes you are posting the right topic, but it would be easier if you numbered each board for easier comments. I've been waiting for someone else to respond because I'm not 100% sure. The previous comment is correct the first board in the first pic is a sound card with a bracket and would be Gold Finger Card NO Fan NO Heatsink WITH Bracket (unless you remove the bracket). The middle board in the first pic looks like it could be a gold edge board. The third board is probably Peripheral High Grade, but might be Backplane Expansion Board. The second pic is an Apple motherboard, I though I read a post that said it would be in the Laptop Motherboard class, but can't find it now.

I'm thinking the rightmost is high peripheral not backplane.

The apple board would be a dual socket? Apple mother/server boards can have their own weird quirks, lost has explained it before but not sure if he covered dual socket.

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I noticed that, but forgot to mention it. Do you think it would go as a Large Multi Socket Server Motherboard?

I'm not sure, the board seems fairly bare but for an Apple that may not mean much if the population that's there is better quality. I'll try searching for lost's apple mobo post.

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Here to learn more so I can recycle more
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It was this post. Doesn't directly help and I'm not sure if it indirectly helps either viewtopic.php?f=4&t=20415&p=38975&hilit=Apple+motherboard#p38975

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Here to learn more so I can recycle more
My grades are my own opinion and not an official grade from Boardsort