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the "spinning beachball" is not caused by video card, it is caused by the processor/ram/harddrive having a struggle. your asking a honda civic to perform like a mercedes. buy a new g5 or a used g4 mirror door dual 1.42 (id just go for the g5).
to anybody with video card replacement questions...
we recently replaced all the monitors in hour shop with apple 23" hd cinema displays. we have a quicksilver g4 that had an agp video card that didnt have the correct dvi interface. i called up cdw, there are basically no agp cards out there for mac with an agp interface still in stock. so i had to go with a pci card, which scared the hell out of me, with windows its a total nightmare to do this.
however, with apple it was as simple as powering down swaping it out powering up and life was good. if your going to do this replace the card with the same brand ati = ati or nvidia = nvidia. althought im 99.9% positive the quicksilver only shipped with ati graphics.
as far as your logic board, id buy a new powermac before i replaced a logic board any day.
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