2 x ATI HD 2600 XT Advantage/Disadvantage Question

I Have the Mac Pro Harpertown. Not sure what they mean by early unit but I am sure mine is not the early one. I purchased it on March 25th 2008. It also has the Reset SM something on the motherboard if that helps distinguish it as a later harpertown?
Ok enough of that now for the question:
I read on the Mac store site that having two of these cards will put it in another mode ( A better Performance Mode) for Games and 3D applications. Maybe they might have been referring to the 2 ATI Crossfire configuration in a PC equivalent not sure.
I go back there again and no longer see anything about advantages to having 2 ATI cards in my system.
SO now I am unsure if having two of them is advantageous or not? I am really not using more than 2 monitors so I don't care about the 4 monitor support.
I was hoping for performance gain in 3D applications like Maya and programs like APple Shake and Final CUt Studio.
I have the 8 core 2.8GHZ with 10 Gigs of ram.
FInal question. Is there a way to buy a off the shelf Nvidia card GT 8800 512 DDR3 as the one that the apple store sells and put that one in my Mac if I somehow had access to updating its firmware?
I am unsure if the 3D applications and other video software will run more efficiently with the 512 card over 2 x ATI 256 meg cards.
Thanks

And that is actually what I thought as well. But after talking to an apple represetative just now they said that the new firmware will allow you to take advantage of two ATI cards and run in a SLI mode combining the power of two cards into 1 for 512 MEg total memory and other features.
Is this how the Nvidia 8800 GT card works now? Two Nvidia 8800 GT cards will run in SLI as 1024Megs and the power of two processors for 3D applications?
Has the Nvidia and Open GL performance issue been reolved yet or is this going to be resolved with the latest firmware I spoke of for the ATI will alos be for the Nvidia to solve software OpenGL and make it more DIrect HArdware Open GL once the firmware has been solved.

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    http://www.xml.com/pub/a/2001/02/14/perlsax.html
    Using the SAX Parser
    http://www.javacommerce.com/displaypage.jsp?name=saxparser1.sql&id=18232
    Class SAXParser
    http://java.sun.com/j2se/1.4.2/docs/api/javax/xml/parsers/SAXParser.html
    Class SAXParser
    http://people.apache.org/~andyc/neko/doc/html/javadoc/org/cyberneko/html/parsers/SAXParser.html
    SAX Parsers
    http://webdesign.about.com/od/saxparsers/SAX_Parsers.htm
    Interface SAXParser
    http://excalibur.apache.org/apidocs/org/apache/excalibur/xml/sax/SAXParser.html
    Class SAXParser
    http://xerces.apache.org/xerces2-j/javadocs/xerces2/org/apache/xerces/parsers/SAXParser.html
    DOM Parsing
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    http://www.w3.org/DOM/
    Document Object Model (DOM) Parsing
    http://www.xml.com/lpt/a/1597
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    http://www.softwaresummit.com/2004/speakers/GrahamJAXP1.pdf
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    http://mail-archives.apache.org/mod_mbox/cocoon-cvs/200305.mbox/%[email protected]%3Eorg/mod_mbox/cocoon-cvs/200305.mbox/%[email protected]%3E
    Easy RFC lookup from XSLT mappings using a Java helper class
    https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/05a3d62e-0a01-0010-14bc-adc8efd4ee14
    XML Transformation Using the TrAX APIs in JAXP
    http://www.xml.com/pub/a/2005/07/06/jaxp.html?page=last
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    gyanaraj
    ****Pls reward points if u find this helpful

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