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-slotTry 2.5 slot and if you get a lot of turbulent noise coming from the GPU fans being too close to the side panel, move to 2.75 slot.