I am not sure that It works with PCI-X perhaps only PCI , so only on G5 1.6 ..but 'bookem" have a 1.6 so let's go ...
I think that only UL4S & UL4D from ATTO works on PCI-X , but not sure ..
Titanium
Seen on : http://www.attotech.com/macsup.html
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ATTO ExpressPCI SCSI and ExpressPCI Fibre Channel host adapters fully support Mac OS X, including OS X version 10.3. Our OS X drivers are available for download on the ATTO Service & Support web page at...