Power for a PCI-E vid card- How do I hook up the extra "Y" cable?

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I bought an nvida Geforce 7900 by PNY Technologies.
It came with a "Y" adapter where the single leg of the "Y" fits the
vid card and the double legs of the "Y" are male Molex connectors with
only 3 prongs instead of 4.
Since the are both male I ASSUME that they both connect to the
computers PS.  I thought one might be a pass through to  replace the
Molex it used, but since they are both male and only 3 pronged, I
don't see how.
I read that with the new SATA HDs you have to hook up Either the old
PS cable or the new type PS but NOT both.  That made me doubt that I
knew what the hell I was doing.

I say assume because I read the FINE instructions several times, and
while it goes into great detail about APG card's power needs, it
skimps on anything about the PCI-E's power need other then to say.
(The APG has two power connectors on the vid card and one to the PS
opposite of what I have on the PCI-E.)

Since this is the first PCI-E vid card I have ever hooked up, I was
wondering if I could get some reassurance.  Hook up BOTH of the Molex
right?  I'm not seeing why the vid card needs two hook ups to the PS -
unless the PS limits the power it sends to each leg of the cables.

Can anyone help me?

The E man.

Re: Power for a PCI-E vid card- How do I hook up the extra "Y" cable?

Eric Kent wrote:
Quoted text here. Click to load it


I'm not sure I can see all the detail in the wiring there, but it
looks like they are using two Molex drive connectors, to power a
2x3 PCI Express connector.

To reassure you, yes, you connect two disk drive cables to the adapter.

A 7900GT is listed here. The Xbitlabs "spread sheet", shows
how the power is split. The PCI Express plug draws half the power 23.436W,
which is only 2 amps from 12V. So it might even be OK with only one
connector hooked up. I don't know if that is the same card you are
referring to or not. 2 amps is the same amount of current that your
hard drive draws during the first 10 seconds while it is spinning up.



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