This is bad, both the non-running drive and the component placement on the motherboard. As win32asmguy suggested, check the BIOS, it should have setting about it. Also I don’t have a motherboard, nor the schematics, in front of me, but I think it should have some kind of mux that switches between SATA and PCIe lines. Of course they could’ve made it entirely PCIe, since it’s, you know, Z Turbo drive 🙂 It’s not that bad, but you’ll have to wait a little longer for more variety.
The slot placement is pretty bad IMO, could be intentional, again, I don’t have the MoBo in front of me, so I’m just guessing – bad HP, bad :p