Gigabyte 890FXA-UD7 @ Hardware Canucks
“The GIGABYTE 890FXA-UD7 comes packed with six mechanical PCI-E x16 slots, and it’s not just for show, this motherboard is one of the few to support 4-way CrossFireX. Because of all these expansion slots, GIGABYTE have had to lengthen the PCB by 0.8 inches past the 12 inch ATX specification. As result, this model is deemed to have a non-standard XL-ATX form factor.”