Chief among the Arc Midi’s features are its pair of four-drive hard drive cages, which are designed to fit both 3.5” and 2.5” drives. Motherboard and graphics configurations are far more limited, since there isn’t enough space beneath the seven-slot panel to properly support a double graphics card in the motherboard’s bottom slot. An eighth slot to the side is meant to hold port breakout plates or an included slot-mounted fan controller.
Removing the center drive cage opens the case for cards up to 17.8” long, but only in slots two, three, and four. That’s only good enough for one dual-GPU graphics card, and even that pairing requires a typical motherboard layout with primary graphics in slot position two or three.