Does T3600 support SAS drives natively?

Hi I have an old T3600 workstation that is working flawless with the latest BIOS (A18), a SSD drive (on SATA-1) and a SATA HDD (on HDD-3), with an Intel iRSTe driver installed. No raid card installed.

Recently I got a SAS drive (4TB Seagate). Google suggests that the T3600 supports SAS drives natively. But I have tried both Win7/Win10, and various versions of the Intel iRSTe drivers. no luck: the SAS drive doesn't show up in either the BIOS or the OS (Win7/Win10).

Before I give up, has anyone had success in running SAS drives on the T3600 natively?

Thanks in advance.