Context:

I have an Intel DX79TO motherboard and a Sun SAS3081E-S/LSI 1060E-S HBA card with a PCIe x8 interface. I plug the HBA into my mobo next to my graphics card, and the HBA power lights illuminate, but the BIOS and OSes (tried Linux, ESXi, Win7) don't see the HBA at all.

Question:

Does the DX79TO motherboard support non-x16/non-GPU devices in its PCIe x16 slots? According to this question, some consumer motherboards don't support this, but I can't figure out whether or not this motherboard/family does. The answer will affect whether I buy a new motherboard or RMA the SAS card, with money attached to each course, so I figured I'd ask here first.

What I've Tried:

I've read the spec/manuals for the motherboard and the HBA, and I didn't see anything regarding whether or not the x16 slots were back-compatible to lower lane widths/non graphics-card devices, or whether or not the card could run in wider slots than x8. I've tried contacting Intel, but that was over a month ago and I haven't yet heard anything back except an automated "we got your email!" message.