Mac Pro with X1900XT and video corruption

Hi gentle people
My Mac Pro arrived a few days ago. It's a CTO with a X1900XT and Aperture and some other options (wireless, RAM, HDD).
I'm really excited about the package and the out-of-the-box experience but yesterday I noticed video corruption in Aperture. It looks like a repeating pattern of green and purple dots.
Today, I investigated further and I noticed these things:
-The dots are in the video memory (can be caught in a screenshot), so it's not a problem with the display.
-The dots can stick around everywhere on my screen, not only in Aperture.
-Google Earth and Quicktime both also display video corruption in the same way.
-The TechTool program from the Applecare disk doesn't find a problem. I guess this is because the memory problem is not situated in the frame buffer but somewhere else in the 512MB. For example, on a location where textures (for Google earth and Aperture) are stored.
-Temperature has no influence; the corruption is there even after a cold night and a cold boot (from power off).
-Apart from this, my system seems stable. No crashes yet and I have about 12 hours on the counter.
-Changing resolutions or SMC reset didn't do anything to improve the situation.
My conclusion: my X1900XT has a bad memory chip or is otherwise defective.
Lucky me; I also bought Applecare. I'll be calling them tomorrow to see what they'll do about this.
What is others people experience with this kind of problems?
Will they send me a good X1900XT by mail? Or will I have to bring in my computer? Arghhlll... Such a beauty with a little rough spot
Kind regards
Koen
Mac Pro   Mac OS X (10.4.7)   Mac Pro - X1900XT - 4GB - 500GB - AE+BT - 30"CD

Hi there kolson
That picture you're showing seems awfully familiar. It's the same kind of corruption as I'm seeing. Only I haven't had a single lockup yet.
I've been on the phone with Applecare this evening. It was a friendly guy who helped me through the basic stuff such as:
-Use the other DVI output on the video card
-Use another monitor
-Log in as a different user
-Reset PRAM
-Reset SMC
-Apple hardware test (no problems found)
-Techtool deluxe from the Applecare cd (no problems found)
-He also asked me to boot in safe mode. I was unable to reproduce the problem this time but the machine, particularly graphics, were very slow. Aperture wouldn't even function correctly. I believe that in safe mode, no hardware acceleration is used so the video card is not stressed at all and the CPUs get to do all the drawing which is why the thing was so slow.
The call ended after this but I have a case number and will be calling tomorrow to see what to do next.
I stay with my previous conclusion: there's something wrong with the video card. It's clear that the display is of no importance because I can capture the dots in a screenshot.
Good luck! I'll try to keep this thread updated.
Koen
iBook   Mac OS X (10.4.7)   I have a Mac pro on order!

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