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As stated in the title, I'm having trouble categorizing these three boards. Any help would be appreciated!

The two square-ish, be sure to pull the lid off the cable box (or remove the entire box if easier, I can't tell how stuck together it is) and then high peripheral.

The server bridge board is interesting. It's essentially a backplane board but with fingers instead of pins and it's otherwise blank. A quick search on the forum didn't yield any clues for me so... could be somewhere between low peripheral and backplane. Maybe someone else has an idea?

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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

Definitely appreciate the input, as I've always had a very hard time with high grade peripheral stuff, despite watching the video(s) and browsing threads here. I'm getting ready to put a box together for shipment, so I want to make sure my eyes are crossed and my tee's dotted.

Regarding that bridge connector with the two gold fingered ends...I'd still like to get at least one more opinion so i put it in the right category.

Thanks everyone.