I’m dead serious. And I do NOT mean “SATA only” since SAS drives would definitely require a SAS HBA.
Your first post? No motherboard (it’s in your third post, and it’s not quite crappy), no CPU, RAM or whatever, no drives, no setup of pool(s). Nothing on hardware. And no use case either.
Nothing except that it’s all virtualised.
Even for virtualising TrueNAS with a HDD pool (as most people have) you do not need a HBA if you can isolate and passthrough the chipset SATA controller—which your board can do.
So why are you asking for help or advice? 
Your motherboard is perfectly capable of bifurcation, down to x8x4x4. That’s good for three drives from the PCI slot, and you can have the fourth on a M.2 slot from the chipset, which, while not an optimal distribution, would work.
Nothing will help with the PCIe 3.0 generation. But you have not mentioned PCIe 4.0 or 5.0 as a requirement anywhere, and for all we know your “4x1,92TB SSDs” (from your third post) could well be PCIe 3.0. And the NAS is never going to serve data faster than the network allows anyway. (Where’s the description of your NIC? Where’s the requirement for any particular speed?)