The Graphics card DIP line
Then the boards are moved into the wave solder machine, where at the backside (remember that mold) the pins are dipped in solder.
Once that is finalized, the GPUs will get a heatsink as that GPU would really love some cooling as well.
Oh and no worries, they have plenty of them. Remember, these lines can produce 50,000 VGA cards alone in this factory, per month.
A little back plating is manual labor as well. Just try to imagine how many steps are needed before a product is finalized. Crazy stuff.