Quick Specs

Smart Array P840 PCIe3 x8 SAS controller – Two internal x8 mini-SAS double-wide ports and 4GB of flashed back write cache (FBWC) memory – For up to 12 Gb/sec transfer rate SAS and 6 Gb/sec SATA

Items you need for the FBWC:

• HP 96W Smart Storage Battery with 145mm Cable for DL/ML/SL Servers – 727258-B21 – 878643-001 – 750450-001 – 815983-001
• HP ML150 Gen9 Smart Storage Battery Holder Kit – 786710-B21 (ML110 Gen9)

ML110 Gen 9 NOTE:
When additional 8SFF Drive cage is ordered and also P840 is selected then must select one separate HPE ML110 Gen9 Mini SAS P440/P840 Cbl Kit (789651-B21)
ML350 Gen9 NOTE:
This server has a spot for the battery under the fans, no need for a holder. It also uses this card when supplying the system with more than 24 SAS drives since it has 2 ports and the SAS card can only support 8 or 24 SAS drives (Depending on what sas controller you install).