Well... by adding an ATA card, you've mitigated the most prominent issue of the Rev A B&W. So why is it any surprise that the machine works well?

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It isn't! Sometimes people discuss Rev. A's like they're the plague or require voodoo to run well (see here: http://tinyurl.com/6qvveh or here: http://tinyurl.com/5tkpkq). Sometimes people even pass them up just because they're Rev. A's! But Rev. A's need love too! Not all of them are flaky... ESPECIALLY when you get past the ATA issues.