The card I bought has these specs : Features 32-Bits. 33Mhz PCI interface compliant with PCI Local Bus Specification Revision 2.2 Four Downstream USB Ports Each USB port dedicated to providing Full Band-Width to the attached device Full Compliance with Universal Serial Bus Specification Revision 1.1 Integrated Dual-speed USB Tranceivers Support for up to 127 devices per port Supports Peripheral Hot Swap and Wake-up System Requirements Mac or IBM PC with one free PCI slot Windows98SE/ME/2000 & Mac OS 8.6 or higher I've tried it in all 3 PCI slots, everytime it bombed with an error 11 on start up, even after zapping the PRAM after every slot change. I tried it with no other PCI cards aswell and it still bombed before the first extension tries to load. I've also removed my audiomedia III card from slot 2 and tested it all the slots individually to check if the slots are to blame, all 3 slots pass in Digitest. Any idea what could be causing this ? I wouldn't want to totally write off the card at the first sign of problems, It's listed as mac compatable and I've already installed the latest USB Card drivers this morning before I bought the card, they caused no issues when there was no USB card to find and they also appear to load last in the extension que at start up. I suppose it could be that card is some OEM brand I've never heard of and cost half what a 2 port card from Belkin or other well known makes but it says mac compatable and has the mac os logo on the packaging and documentation that came with card. I know to get a 4 port card for about 2 3rds the price of a 2 port "branded" card is maybe too good to be true but this is kind of a wierd problem I can't solve with software updates or extension manager. My Mac's specs : Beige G3, 300Mhz 512K L2, Rev A mobo with ATI Rage II+ (6Mb Vram), 320Mb RAM, OS 9.2.1 and an audiomedia III sound card.