We have purchase SYS-2028R-C1Rt4+ as well as the Supercap cache vault for the SAS3 3108 controller with part number: BTR-TFM8G-LSICVM02.
Can you please also advise as to where does the BTR-TFM8G-LSI-VM02 plug into the SYS-2028R-C1Rt4+?
For the SYS-2028R-C1Rt4+ system with motherboard X10DRC-T4+, the SAS3 controller is onboard, so the connector for it is on the motherboard.
The connector is at the bottom left corner ontop of the SAS3 Mini-SAS HD connectors