The picture where I'm pointing, that's where everyone's posts live.
Then the innards. There are two tiers, CPUs 3 and 4 as well as RAM banks C and D are on the top tier, which plugs into the motherboard and is held in place by a latch. The bottom tier is where the notorious "Bank 18" lives, which is the location of B7. B11 is sitting useless, because the RAM is installed in pairs.
Hilariously, I left the ethernet cables plugged in and yanked the heads off them when I pulled the machine out of the rack. I also picked up the wrong USB serial cable and thus could not plug the DevTerm into the server and had to wheel in a crash cart.