EE-ATX is SuperMicro's proprietary format, a slightly wider SSI-EEB. Nearly all their cases will work (825, 826, 836, 846, 847, etc). Fractal Define 7 XL also fits it with full support for all standoffs. Enthoo Pro works but it's a tight fit and not all standoffs are supported.
Friendly reminder: motherboard mounting holes without a matching standoff are ok, though not ideal (you could stick a rubber bumpon). Chassis standoffs without a matching motherboard mounting hole are a definite no-no; that can make memory channels flake out, or worst case short out the board and kill it.