Looking inside our Dell PowerEdge R220 we can see a relatively well laid out design. There are a total of four fans cooling which spreads enough airflow around the short depth chassis.
Underneath the CPU and memory shroud we can find the LGA1150 socket, passive heatsink and four RAM slots that accept up to 32GB. The dual chassis fans provide redundancy in the event of a failure so that air will still move through the shroud.
There is a single PCIe expansion slot in the chassis and plenty of room for most add-in networking or storage cards. We fit NVMe drives as well as network cards like Mallanox dual port FDR Infiniband cards in the riser.