1U SuperChassis 813M The SC813M 1U Chassis is a density-optimized mid-level server chassis, ideal for storage appliances, HPC, and datacenters. With a depth of only 19.85", its compact design houses ATX motherboards of up to 12" x 10" and supports one Full-height, Half-length PCI addon card. A selection of optional LCD front bezels are also available for customers who require customization. Bulk package and quick release slide rails also available for HPC and datacenter use.