ATI x1900 xt same as pc version?

Hi dumb question looking to upgrade my mac pro i wan to get the ati x1900 xt i seen it around for under 200. it sez cross fire ready can i used this card in my mac pro?
the min i see the ati x1900 xt on a mac vending site they call it a and upgrade kit and charge double.
Tommy

However, ATI (and now AMD) might choose to update the ROM version firmware at some point, and it could make it inoperable. Maybe not. And you might not know that an OS update was updating firmware (has happened on OEM SuperDrives).
EFI requires a 128K ROM while most video cards use to use 64K. I never visit ebay so I'll take your word that a "near identical" retail card works. That makes sense.
This isn't about drives or RAM and prices but about compatibility.
When I looked around wanted the newer Zipzomfly: X1950 model $395 I saw a number of 256 and 512MB and the best or closest model to what Apple offers (which is only $250 extra BTO) was $379.
The "inflation" is also trying to get vendors to hire programmers that know Open Firmware code and can write drivers, do the testing and much more. I think the gap will close. Vista 64-bit has some support for EFI but they are waiting for 2.0 (Apple is at 1.1 right now), but not 32-bit Vista. And drivers for 64-bit Vista (and antivirus etc) are a huge problem and aren't ready.
Nvidia wants Apple's FCP and Motion user business and ATI is focused on getting the R600 series ready and out in the next months.
There are some threads from back when the Mac Pro came out looking for alternate cards, flashing, as well as whether one would have trouble connecting to the power plug Apple uses, which is unique and perhaps unfortunate.
Message was edited by: The hatter

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    Is it the G% version?
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    Hallo again,
    I was writing about some problems with ATI X1900 G5 card but nobody tried to help me, so maybe I will try to ask once again.
    I am new on the forum but please write me some sugestions/solutions how to have good performance in Motion 2 with an ATI X1900 G5 card.
    Does anybody have problems with opening projects in Motion? My projects are opening very long and the rendering time is about 10 percent worst then with NVIDIA 6600 256MB.
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    Hello Patrick,
    thanks for your reply. After reading some of your post and watching some of your works (globe, presentation on your web site, etc.) I see that you have a lot of experience in graphic cards, in Motion and other PRO apps. So, I hope for the best
    I am sorry, I don't take offense about flashed PC cards, because I know that it is possible. But I completely don't know how to do this, and I don't know nobody who can do this properly. So, I decided (even paying more) to buy a card designed for Mac G5. And because of that I am frustrated - this card should work! - without thinking that maybe I did something wrong during flashing, that I had wrong ROM, etc. If I had flashed PC card, card I could say: OK it was my risk, something went wrong and the card doesn't work at full speed. But now, I hope you understand my frustration.
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    I know that all the video memory is shared between monitors, but when I had an NVIDIA 6600 256MB, in a System Profiler I saw 256MB Video Memory. Now, with the same 2 monitors - only 128MB.
    The OpenGL Extensions Viewer shows:
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    Now, your project globe:
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    Hello,
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