XPS 8930, looking inside, RAM slots, add SSD

1. I want to upgrade the ram from 16mb to 32mb. According to plans I have seen and what task manager says, I should have 4 slots, but I only see two. I will look again later, but I only see two long ram sticks. (unless they put a dummy in two of the slots. I was all prepared to change the power supply so I didn't pay that much attention. However, being 75 and with bad eyesight, I am going to have to let someone else do the power supply. Is it possible that I only have two slots?

2. I was wanting to add another SSD to my computer but this time, a 1tb.  I only want to use it for storage as I want to move my Stable Diffusion folder to it. I got to reading about the NVMe. When I had my computer open, I did not see a place for them. Next to my graphic card slot, I have two slots that are labeled pci 1 and pci 4.  Is this where you would put a NVMe to PCI? It seems a lot easier to install the NVMe than an SSD. But I didn't see where there was a data cable. I watched videos on people installing them and I don't see them attaching a data
cable.

Thanks