Current list of compatible Fractal Design cases:

  • Define 7
  • Define 7 XL
  • Define 7 Compact


The Flex B-20 will replace 7 horizontal PCI slots in order to vertically mount a graphics card in the middle of the chassis. This results in the graphics card being in the direct path of air from front mounted fans for better airflow than vertical mounts that are up against a side panel.


The Flex B-20 can only be used on cases that have "bridgeless" PCI slots (examples shown below), as you would not be able to connect video output cables into the graphics cards on a case with bridges between the PCI slot covers.


The case on the left is our Define 7 Compact that has bridgeless PCI slots (I.E. no bars between the PCI slot covers). While the case on the right is our Meshify C which has bars between each PCI slot.