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If we remove all drive caddies located on the left side, you can see the actual motherboard slash PCB. Nothing much is going on there aside from the fact you can see a heat sink that cools the processor. It's passive and thus uses the cooling fan housed in the back of the NAS. If you look closely, you can also see one DDR4 3200 MHz SODIMM installed whereas DDR4-2933 is listed on the ASUSTor website.
As mentioned you can easily upgrade this NAS towards even two 8GB DDR4 (SODIMMS), pop in a compatible module and you're good to go, now in a dual-channel configuration as well (mixed capacity is supported).
At, well in, the rear of the NAS we see the SATA3 connectors, four of them. If you are going to install HDDs, please check the ASUSTOR QVL list of supported units. Most of them will all work fine up-to 20 TB even. Always check the linked QVL list for supported storage units.
With the cover removed, you'll stumble into a single M.2. slots. So yeah, four NVMe SSDs in a NAS, that's a pretty darn premium option to have if you ask me. Lovely. One remark, the NVMe SSDs lack active cooling. The position of the fan is lower. Considering your LAN throughput is roughly 300 MB/sec we doubt any M.2. unit would ever overheat and throttle down in speed, though. The fan is also moving air over these units.
One problem with this PCB M.2. design is that the M2 storage unit sits tightly next to each other, if you install two M.2 units with heatsink next to each other, spacing (the lack of it) might become an issue.
Though specced 2933 MHz, This NAS unit has a single 4 GB 3200 MHz DDR4 DO-DIMM installed. You get 4GB. But if you'd like to, you can make that 2x8 GB find dual channel as you can swap out memory.
