Over the last month since the Mac X800 XT cards were (finally) available (one last production run apparently) I've had more than what I'd consider a normal percentage of problems reported (typically display artifacts - suspected to be a vram issue.) I wrote a contact at ATI to ask about this. One reader that had 2 samples with the same problem also sent a link to an apple forum thread on the problem with other replies (one post there noted 3 out of 7 samples affected). BTW - while on the subject, the Oct. 31st news page had a Tip for anyone with Display/Sleep problems in 10.5 with ATI Radeon cards (due to System/Library/Extensions/AppleNDRV folder missing the ATI ROM Xtender file)

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