Power available for GPU/graphics card/Quadro 4000

Question

I need to upgrade to a Quadro 4000 GPU in order to use DaVinci Resolve on my Mac Pro.  DaVinci needs to graphics cards for full operation: the Quadro to process video and another card to actually run the displays (an Apple 30" Cinema Display and a 21" DVI monitor).
Any of the decently powerful cards I'm looking at require power from the mainboard -- which has two power outlets.  The Quadro 4000 requires both of them.
Is there another power source available somewhere inside the computer to run this second graphics card?  Or perhaps someone can suggest a good solid graphics card to run the two displays that does not require power?

Answer 1

And your Mac running OS X will not accept the Quadro 4000.
http://store.apple.com/us/product/H3314LL/A
Same card on Amazon for $790 with MacPro3,1 or later
http://www.amazon.com/PNY-DisplayPort-Profesional-Graphics-VCQ4000MAC-PB/dp/B004 CRS78O/
There are some helpful comments there like this one:
i work in 3D visual effects, post production, and graphics.
this video card works fantastic under Windows 7. the Windows drivers for the Quadro are finely tuned and allow particular applications to take full advantage of the video card.
under OS X, the card is NOT worth the premium cost. my ATI 5870 performs better in applications that the Quadro 4000 is suppose to work better with. for the life of me, i can't understand why Nvidia/Apple can't get these drivers right under OS X. its the same story, Quadro release after Quadro release. Nvidia and Apple just don't seem to care. my current 2010 12-core Mac Pro might be my very last Apple desktop. i just can't justify the Apple tax anymore if Apple isn't going to provide basic stuff professionals need. it just seems like Apple is drifting farther and farther away from the professional market.....so disappointing.
another extremely annoying thing is that i can't have my ATI 5870 and Quadro 4000 running at the same time. the Mac Pro only has two 6-pin power cables!!!! what's with that!! are you kidding me??!!
So you need to look at a new Mac. Or running Windows. Or... something.
2008 brought with it EFI64 / UEFI which is what you would need right now. Had you waited back when you did buy your Mac Pro until March 2008.... you would really have been set as far as usiing Quadro or GTX 285 and having 64-bit EFI.  I just think this is another of those times.
Not everyone is ready to and running Lion, but Lion does have some support for the GTX 580, which is more power.
http://netkas.org/?p=1059
http://forum.netkas.org/index.php/topic,979.0.html
http://forum.netkas.org/index.php/topic,979.15.html
This: support for GTX cards even in MacPro1,1 if you have 10.7,3
http://forum.netkas.org/index.php/topic,1897.0.html
Why wait? Ivy Bridge from Intel in April will and has to arrive someday on Apple's desktop.
the GTX 680 arrives on 23rd, and AMD has their new line of GPUs, so something there.
Your GTX 285 no matter what, unless the seller isn't what he/you say they are, should work in Windows, Mac OR PC. I've used GTX 260 in my Mac Pro and in a PC with X58.
Vendors are coming out with Thunder storage arrays more so now, more for laptops and other systems, but there and using optical.
Given your needs etc I would find someone that wants your system and PowerPC etc and part with it. If you can't wait, or don't want "1.0" and want solid mature and known hardware, pick up one (you could even get the $2100 2.8 4-core ref'd model and do the W3680  6-core 3.33GHz  $599 yourself.
www.macperformanceguide.com has a number of tips. The guy is now running 100% SSDs with a pair of PCIe controllers populated with 1TB SSD modules on each, and 48GB RAM. 2010 lets you use 3 x 8 or 16GB RAM also.