Which heatsink type is NOT supported on Dell PowerEdge R730/R730xd?

The heatsink type that is not supported on Dell PowerEdge R730/R730xd is the 3U heatsink. The R730 and R730xd typically have a design focused on optimizing performance and airflow within a specific chassis size, and the supported heatsink types are usually designed to match the server's 1U and 2U form factors.

1U and 2U heatsinks are specifically engineered to fit within the server's height constraints while providing adequate cooling for the components. The 1.2U heatsink is a variation that fits within the specifications defined for this model, allowing for additional cooling without exceeding the server's height limits.

The 3U heatsink is not catered for in the R730/R730xd system due to its larger size, which would not be compatible with the chassis dimensions of these servers. Adhering to the proper heatsink type is crucial for ensuring optimal thermal management, performance, and compatibility within the server environment.