ATA cards have had issues with the older PCI slots from the beginning and Sonnet's seem to be some of the most consistent in that regard. The most noticeable symptom has been stuttering when playing back audio. From my understanding it results from some kind of improper synchronization and the PCI bus gets overloaded. SCSI controllers have remained devoid of this issue. I've personally never had a performance or stuttering problem when using Acard's adapters though. YMMV.
This is exactly my experience with the same controllers in PowerSurge machines. I have had only Acard ATA designs and have never had an audio stuttering issue in 7300, 7600 and 8500 machines. In fact, my first mp3 jukebox was a PMac 7600 604e/260MHz with a TurboMax ATA/33 (Acard rebranded) with a 12.7GB Quantum EX ATA. No stuttering, even when moved to a clone machine- a MacTell XB 200 MHz 603e (same as Motorola StarMax 3200).
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