In the product description for the Penta SATA Hat on allnetchina, it says:
PLEASE NOTE: You need to order the heat-sink with Rock 4, otherwise the Penta HAT can not be mounted on top. For use with Rock 3A please purchase the base plate for proper installation.
Do I really need this heatsink to use the Penta SATA Hat?
The title of this item leaves out the 4A+, will the same heatsink also work for the 4A+?
The picture in Section 4.2 of this PDF shows the Penta SATA Hat on a Rock 4 with no heatsink, so it looks like it works without a heatsink:
Please inform if the heatsink is truly necessary for mounting.