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2.1 GHz G5 processor

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do I have to backup my memory before upgrading RAM

I am upgrading the ram in my iMac G5 A1145 model comp. and am not very computer savy, was wondering if i need to back up info like pictures and music?

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no, there is nothing permanent stored in RAM, its contents are lost whenever you power down your computer anyhow. you can freely upgrade your RAM - all your data is stored on your hard drive

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