Sashby

The motherboard inside the i180/i182 is an ASRock X299E-ITX/ac (a modified/custom verison of that motherboard. Known differneces between the retail motherboard and the one inside the Corsair One i180/i182 is the USB 3.0 header orientation is changed so that the radiator can fit with a USB3 internal cable attached. Otherwise the cable would have protruded far too high above when populated). As Jake had stated the motherboard should have a total of x3 M.2 SSD slots (one on a riser card on the front and two on the rear of the motherboard, inaccessible without removing the GPU). The front M.2 slot can be removed quite easily due to it being designed like a vertical RAM SODIMM slot. Removing the riser card is the same process as removing a RAM stick. There is only room for one 2.5" Drive and it's populated with a HDD as standard. The manual for this motherboard is available on ASRock's website. ASRock X299E-ITX/ac manual link