apg slotAn AGP 3.3V motherboard connector can only accept AGP cards which have the 3.3V slot. If you try to insert a card without a 3.3V slot into an AGP 3.3V motherboardOn most motherboards, an AGP slot is black in colour while PCI slots are coloured white. So what you are looking for is a black slot close to a number of white coloured slots on