Just what I was looking for!
I had been putting off upgrading my older iMac but finally got around to it because I needed a Firewire port. The installation went fairly smoothly with good directions from Sonnet. I had been into my iMac before to upgrade the RAM so it wasn't anything new. When I put it all back together, it wouldn't boot at all. I took it apart after contacting Sonnet tech support, who recommended to reseat everything I had put in. I did that, and found that the processor card wasn't seated tightly enough. It needs to be pushed down with quite a fair amount of pressure to make proper contact. Upon the next bootup, it gave me the message that the upgrade was complete. Apple Profiler registered the new processor immediately, showed that all 512MB of RAM was working. Now our strawberry iMac runs much better all around. I see noticeable improvements from the old 333MHz processor, plus I can use all my Firewire peripherals, like external hard drives, DV camera, etc. I recommend this product if you're not in the market to buy a new Mac but need more speed and greater flexibility. Plus, buy.com has the best price I've ever seen on this product, and it arrived in two days using ground shipping! It's not a G4 or G5 but I wasn't expecting that kind of performance. Virtual PC runs much better in OS 9, still kind of pokey in OS X 10.1.5 though where the G4 or G5 power is needed.
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