Motherboard expansion slots (PCIPCI-EAGP) -

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 motherboardI started a thread about another odd type of motherboards, Socket 423 and 478 motherboards with the universal AGP slot which are not as common as their 1.5v keyed only