Over the years the slots used for video cards connected to a motherboard have varied.
The oldest interface used on motherboards was the Pci slot not to be confused with Pci-e that we use to day for the vast majority of graphics cards connected to the motherboard.
After the Pci card slot running at 66 Mhz in speed, came a dedicated graphics port slot placed on motherboards of AGP.
AGP provided more bandwidth for graphics cards connected to the propriety AGP card slot found on the motherboard and could run at a slightly higher clock speed also.
The two slots used at the point in time did not require you in many cases of your graphics card choice be it Pci, or AGP interface used, or card interface type bought.
Any extra 12v power feeds direct from the Psu of the system.
Because the power consumption was well within for most graphics cards on the market at that time or era was low enough to be provided by the slot you were connecting it to be it as said Pci or Agp type connection or motherboard interface slot Yun3515.
Pci-e was designed in such a way because company`s such as Nvidia, And Ati. as well as the brand makers or manufacturers of motherboards knew that Gpu`s on graphics cards in order to gain power would require more transistor count. Requiring much more power than any graphics card slot of the motherboard could deliver on it`s own.
Hence why we now due to high transistor count of gpu chips why we need more power to run them and the amount of wattage the cards used while utilizing the full processing power of the Gpu chip greatly increased.
If the card is of the AGP Generation, it will will require that you have a motherboard with a AGP port on it.
The Pci interface is a totaly different interface compared to a PCI-E graphics slot you find on new motherboards you see today, and of about three to four years old.
Pci runs at 66Mhz bus speed.
Pci-E runs at 100Mhz bus speed + 33% improvement in performance.
Yun.
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