Hi, I am a noobie here so bear with me. I should have read this forum before doing what I did. Anyway, I wanted to upgrade my ram fully to 1GB for my Yosemite G3 B&W. Bought 3 more 256MB Kingston RAM, installed them and they are showing half of what I actually have. So searched the internet and saw a post here that described exactly what my problem was. I mean down to the pin head details. Well! I am exaggerating here. But true enough, I am not suppose to use an 8 chip SDRAM and when I looked at my new RAMS, I have the 8 chip ram. I should have the 16 chip ram which will definitely work as my old 256MB SDRAM I am currently using on my MAC has 16 chip ram. Macrumours forum, thanks for helping me. You are a savior.