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PCI Express Power Connectors

  • Graphics Cards
  • Power Supplies
  • Power
  • PCI Express
  • Graphics
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Last response: in Graphics Cards
May 29, 2010 7:13:54 AM

I'm curious about how the video cards and power supplies evolved to requiring two connectors? Does anyone know how this came to be versus just having a single connector?

More about : pci express power connectors

a b U Graphics card
a b ) Power supply
May 29, 2010 7:37:28 AM

It's a matter of how much power the GPU needs. The socket supplies up to 75w, a 6-pin connector adds another 75w and an 8-pin connector adds 150w. For example the 5670 can use up to @ 63w so it doesn't need an additional connector. The 5770 uses @ 100w so it uses the socket + a 6pin connector. The 5850 uses @ 150w so it gets the socket + 2 - 6 pin connectors. The 5970 uses @ 300w so it gets the socket + a 6 pin and an 8 pin.
a c 224 U Graphics card
a c 143 ) Power supply
May 29, 2010 7:39:21 AM

Electrical code. The wires on a PSU are small. You send to much power through them and you can literally melt the insulation off. By using more then one set of wires you can safely send the power that the video card needs without burning anything down/out.