Dolf, I see that you and I are looking at the same places!
I've also noticed that the higher cards have unstuffed resistor networks on the topside next to the BGA, and the lower end cards have these stuffed. Some of the higher cards also have different resistor settings(either VCC or GND) as you mentioned before.
I propose a high res picture of every different version of card so that we can group them and figure out if certain setups have certain terminations. I haven't had time this week to do much investigation.
I'm interested in the R480.
Do the cut traces on the BGA correspond to pads on the BGA grid itself? This may be what we are trying to figure out.
I've also noticed that the higher cards have unstuffed resistor networks on the topside next to the BGA, and the lower end cards have these stuffed. Some of the higher cards also have different resistor settings(either VCC or GND) as you mentioned before.
I propose a high res picture of every different version of card so that we can group them and figure out if certain setups have certain terminations. I haven't had time this week to do much investigation.
I'm interested in the R480.
Do the cut traces on the BGA correspond to pads on the BGA grid itself? This may be what we are trying to figure out.