t1 slotSwitch FormD T1 From 2-Slot Mode To 3-Slot Mode. Since the air cooled GPU we will be using is massive, we need to switch to 3-slot mode. First swap out the 2-slot GPU bracket for the 3-slotSlot opening width : 4mm Finger width : 6mm; Colour : Grey RAL 7030; T1-E = 40mm and 60mm hehts; T1-EF = 80mm and 100mm hehts; T1-EF have an extra cable retainer moulded into