I have operated my Arcus II scanner with an ATTO Express PCIPro UL3D card In a PowerMac G5 Dual 2GHz Tower with absolutely no problems for more than four years. The card is a second hand (ebay) Apple OEM card extracted from a previous Mac model and was reasonably priced. I would suspect that as long as a PCI expansion slot is available in a tower the Arcus II will keep working for another seven years. ...fl...