RM41300 8-Slot upgrade to support CRPS & 2 GPU Truly isolated anti-vibration design on internal HDD cage and drive cage Optional second 3 x 5.25" drive cage for maximum configuration flexibility Dedicated 80mm fan for HDD cooling PCI-e card retainer to hold low profile and full height add-in cards (RM41300) Supports stand-alone installation via optional kit (RM41300) Supports 1-door or 2-door front bezel configuration (RM41300)