apg slotOlder Expansion Slots on Motherboards 1. AGP Slot. Stands for Accelerated Graphics Port, this slot is available only in older motherboards to connect the graphics card for accelerating 3D output. AGP offers fasterThe AGP Pro slot uses 5 volts and a regular AGP slot draws only 1.5 or 3.3 volts, misalnment will cause a regular AGP card to draw 5 volts and fry the video card. It's imperative that a