ATI Radeon 2600 screen/graphics artifacts - anybody else seeing this?

I got a new Mac Pro (2 X 2.8 GHz Quad-Core Xeon) direct from the Apple on-line store about 3 weeks ago and have been *incredibly impressed* with it.
However, each time I use the machine for an hour or so for anything graphics intensive (e.g. playing a QT movie) I start to get huge polygon "artifacts" on the display:
http://gallery.mac.com/russell.archer#100018/IMG_0030&bgcolor=black
The machine continues to behave solidly in all other respects while the artifacts are displayed (and they shift and change, sometimes disappearing for a second or two). Once the the artifacts have appeared the only way to get rid of them is to reboot, then all is back to normal. If I stick to non-graphic intensive work like using Xcode, VMWare, etc. then I don't have any problems - it seems to be a direct of result of using either QuickTime or other movie-related stuff.
The Mac Pro has never crashed or locked up, even when the screen artifacts are displayed.
I have Leopard 10.5.2 with all the latest updates, including the latest firmware updates.
When the artifacts first appear, there's no noticeable difference in the speed of the fans and looking at all the temperature readings (with Hardware Monitor) everything seems cool.
I've done all the usual stuff like a fresh install, zapping the PRAM, etc.
Looks to me like there's either a problem with the ATI 2600 graphics card drivers or perhaps a temperature-sensitive issue in the actual card hardware (I haven't yet tried speeding up the GPU fan to see if this helps).
So, before I ring Apple support, has anybody been seeing this sort of thing?
Thanks in advance!

Hi, I faced this terrible problem too. And I just learnt that it is a bug in the Apple's Open GL drivers. It has to do with Leopard, ATI and Nvidia cards. And I don't know how to solve it! I read on some other forums that it is a problem that ATI acknowledge and there is no solution to it as yet. Mine is worst, lots of distortion, artifacts, coloured triangles, coloured lines, everything that is so nightmarish that affects my work (I need to work on images on photoshop, long hours on the computer). I really need some kind advice from someone. Really very depressed and upset over this Mac Pro that I bought in barely a year.

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ATI Radeon 2600 XT on Mac Pro 2008 has died

Hi All,
I have recently been having issues with one of my ATI Radeon 2600 XT Graphics cards - choppy graphics, artefacts appearing on the display and endless crashes of the OS.
I have read online about a recall program Apple did run which recalled these exact graphics cards, and after checking the serial number of the card in question, it does indeed match one of the 'bad' batch.
The only problem is - the program ended in July 2011
What are the chances Apple would be kind enough to still swap my card for a new unaffected one?
Thanks
Mac Pro (early 2008)
6GB Memory
2 x ATI Radeon 2600XT
2 x 23" Cinema HD Monitors

What are the chances Apple would be kind enough to still swap my card for a new unaffected one?
I'm in the same boat. :\ Mine just died too, would I need to take my tower to an Apple Store? Or how would I go about asking Apple to replace my graphics card?
Also, if I were to put in a different graphics card (say the ATI Radeon HD 5770), how difficult is it to replace? Would my Mac Pro (Early 2008) be able to handle it? I have 2x2.8GHz Quad-Core Intel Xeon (8-core) processor, the ATI Radeon HD 5770 says it requires Mac Pro (Mid 2010) with PCI Express 2.0 slot and OS X 10.6.4, whereas I'm still on just 10.5 Leopard and have an Early 2008 model...
On another thread, here, The Hatter, said something about baking the card in the oven? Would that work if Apple won't replace it for free?
I have never opened up my tower before (I don't know how!) and I have been wanting to upgrade my RAM as well. I have 4x1GB cards and I wanted to move up to like 8 or 16GB. I was thinking about buying RAM from NewEgg or Amazon, whichever is cheaper, any suggestions?
Thank you for any help and sorry about hijacking the thread! >~< Should I make my own thread or continue in this one? I'm sorry, I just don't want to cause any problems...I will make a new one if need be.

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1) Apple brand cards,
2) "sold in the Apple store" cards, and
3) "Mac Edition" cards ...
... show all the screens, including Boot up screens, Safe Mode, Installer, Recovery, debug screens, and Alt/Option boot screens. At this writing, these choices include:
1) Apple brand cards:
• Apple-firmware 5770, about US$250** works near full speed in every model Mac Pro, Drivers in 10.6.5
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• NVIDIA Quadro 5000, about US$2500
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• SAPPHIRE HD 7950 3GB GDDR5 MAC Edition, about US$480** Vendor recommends Mac Pro 4,1
• EVGA GTX 680 Mac Edition, about US$600
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CPU B Temperature Diode 35.0C
CPU C Temperature Diode 35.0C
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Hard Drive Bay 3 27.0C
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Memory Bank A Point 3 34.0C
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Memory Module B1 48.0C
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Power Supply Location 2 40.0C

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Normally I would expect a new or even ref'd unit would have the latest fixes and if there still are problems... then there aren't any solutions? One person dropped into Vista and reduced fans to 20% setting and it works even under heavy loads w/o getting above 80C.
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"The Accelero S1 Rev. 2 dramatically extends the compatibility to many of the latest graphic cards. It supports high-end to main stream graphic cards including the latest hot selling Radeon HD 3870, 3850 , GeForce 8800GTS (G92) and 8800GT. http://www.arctic-cooling.com/vga2.php?idx=147
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ATI Radeon 2600 screen/graphics artifacts - anybody else seeing this?

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