Is it possible to upgrade both RAM sticks in a Powerbook (the one listed in my sig) or only one of them? I didn't get the single 512 stick but I would like to upgrade to 1 GB of RAM. Am I screwed? 
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upgrading RAM in Powerbook
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I'm kidding. It's actually possible for you to upgrade to 1.25 GB of RAM, at least. I may be wrong about this model but I think some of the RAM is soldered to the motherboard, and there is only 1 RAM socket. So, you could put a 1GB DIMM in there.
I'm having the same problem....two 256MB sticks. If you want 1GB total, you'll have to replace both sticks - best advice would be to sell them on ebay...I know it sucks...is price the only reason why 512MB is shipped with 2 256MB sticks instead of one 512MB stick?? Or is it stability?
I got the OWC brand 1gig Ram at ~$267 or so. I can highly reccomend this as good quality and one of the best prices for trusted 1 gig ram.