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Question:

 I installed an nVIDIA/ ATI high-end graphic card which has 2 power connectors  (2x 6-pin and 1x 8 pin connector or 1x6) and my computer doesn’t start anymore or turns off after a few seconds.

Answer:

Our power supplies have 4 separate 12V rails, and adhere strictly to the applicable safety requirements, namely, each 12V line shall not exceed the maximum continuous power output of 240 Watt/20A (depending on model). The power supplies have two 12V rails for the graphics card and have two connection options: either 2 x 6-pin PCI-E connectors or 1x 6-pin and 1x 8-pin (2 +6 Pin) PCI-E connectors. The 12V line is marked on the port with a PCI-E and PCI-E 2.
Please note that if connecting the graphics card with a power supply from 240W up to 400W, the two separate 12V power connectors of the graphics card (PCI-E 1 and PCI-E 2) are used to spread the maximum load on both 12V rails. Otherwise, the PSU won’t start or will turn off immediately due to the protective functions.


Example:

The ATI HD 3870 X2 graphics card has 2x 6-pin or 1 x 6 - and 1 x 8-pin PCI-E connectors. The graphics card requires about 370W under load. If you connect the two PCI-I connectors only to 12V1, the PSU will not start or turn off after a short time because one 12V rail will only provide 240W. If you connect the graphics card with the 6-pin PCI-E connector of 12V1 and the 8-pin PCI-E connector of 12V2, your system will run without any problem.

 

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