Are you sure? I've seen plenty of motherboards bundle a PCIe riser to passively bifurcate the PCIe slot to support four M.2 drives in an x16 slot or two in an x8 slot, but doing eight M.2 drives in one PCIe slot would either require a PCIe switch that would be too expensive for a free bundled card, or require PCIe bifurcation down to two lanes per link, which I don't think any workstation CPUs have ever supported. And 32TB is possible with just four M.2 SSDs.