Hi there
My first recommendation is to post fewer pictures, like less than 10. This way it won't be like a big task for anyone to help and your post doesn't get ignore by the moderators nor the other sellers.
Brown boards are always low grade unless it has gold plated pins like the floppy disk board. Also, you can do a process of elimination. For instance, if you pulled a board for a hard drive it is then a hard drive logic board. If it has gold finger then it is a gold finger card and so and so.
This is my take.
Peripheral: 2,3,4,6,7,9,13,14,15,16,17,18,19,20,21,22,23,24,25,26,31,35,37,38,39,40,41, 42,43,44,45,46,47,48,49,50,51.
Mid-grade: 1,32,36,34 (you could remove the ic chips without downgrading the board)
CD/ROM board: 8,10,11
Hard drive logic board: 12
Low grade: 27,28,29,30,33 (you could remove the ic chips without downgrading the board)
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