PSU question

[arges86]

So i upgraded my graphics card from a GeForce 8800 GTS, to a GeForce 470 GTX. The later requires 2 6-pin connections from the PSU.

My power supply, had a cable that had a 6 pin connection on it, and then another 6 pin that branched off from it. So i plugged them both in. No Dice, didn't work. System just gave me a long beep, and nadda on the screen.

It wasn't until i had two separate cables that had 6-pin connections run the GPU that it turned on.

Why couldn't i run the card the first way?

the card: http://www.newegg.com/Product/Product.aspx?Item=N82E16814500167&cm_re=470_gtx-_-14-500-167-_-Product

the PSU: http://www.bfgtech.com/bfgr800wespsu.aspx

 

[rolli59]

Because the one cable could not deliver the power the card needs coming of the same rail. Two cables two rails.

 

[arges86]

then whats the point of the two connectors on the same cable?

 

[rolli59]

then whats the point of the two connectors on the same cable?

It would work for a lower power cards 2x 9600GT in SLI as an example.

 

[arges86]

ah
i c
thanx

 

[arges86]

Best answer selected by arges86.