supermicro - Possible to use SAS-2 and SAS-3 HBA in the same system?

I'm wondering if it is possible to use a SAS-2 HBA in a
"SAS-3" system.

I have a Supermicro X11DPH-T and
have attempted to install an LSI 9201-16e. From what I understood (which may be wrong),
a PCIe 2.0 card may be installed in a PCIe 3.0 slot, but the slot will negotiate down to
5GT/s. Unfortunately, even setting the PCIe slot to 5GT/s manually did not not allow the
card to work in the system. It initializes other PCI devices, but when it gets to the
9201-16e, the screen displays a blinking cursor in the upper left hand corner, then
about 30 seconds later, the system reboots. This will continue indefinitely until
shutting down and removing the card.

Is it at
all possible to use a SAS-2 card in this system or is the issue strictly PCI
compatibility?

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