Help Needed - 2 graphics cards

I just bought a Radeon ATI 1900 G5 edition online for my PowerMac G5. I already have a GeForce 7800GT as the primary card but I thought the new card would double the performance. I also thought installation would be as simple as popping in the new card. Obviously I should've done my homework a little better.
Each card seems to need the extra power connection from the motherboard, but as far as I can tell, there is only one power cord.
What to do?
I run FCP5, Photoshop, and AfterEffects and I want as much graphics horse-power as the G5 will give me.
Is it possible to have both of these cards installed?
Advisable?
If so, how do I do it? Can one of them run without the external power cord? I assume I would use slots 1 and 3?
Please shed some light for me. I feel silly for having bought the card as it seems it may not help my situation. The customer service guy gave me the impression it was going to work fine.
Anyway, please give me some feedback soon if possible as I'm anxious to try out the new set-up.
Many thanks
S

So you're saying that two graphics cards would in no
way boost performance in graphics apps like PS, AE,
or FCP?
Some PCs use multiple graphics cards with SLI to increase performance, but Macs do not support this.
That the only reason people use multiple
cards is to have many monitors?
Correct (at least for a Mac).
I thought the extra VRAM would help with my rendering
and real-time effects, no?
The extra VRAM is on a different card, and without SLI to connect the cards, there is no way it can be used.
Ever heard of anyone somehow using two cards?
Not two high power cards,
Do they make a splitter for the power connection?
No. You would have to make your own. It wouldn't be too hard to splice two power cables.
Or is it risky to have two cards running for power reasons?
The total power consumption would probably be OK, but only slot 1 is rated for high power cards, and the auxiliary power was only planned for one card
Or could the NVIDIA run without the power connection from slot 3?
No. It can't even do that in slot 1, which provides a lot more power than slot 3.
I have no other PCI cards in there so I would run two
if there was any benefit to be had.
With no other cards, there is probably enough power, but it is spread over the low power slots 2, 3, and 4.
But I am only using two 23" monitors so maybe there isn't.
The extra card would just be using power and producing heat.

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