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2008 Mac Pro RAM upgrade configuration

Posted on 2014-02-10
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I just purchased 4x2GB of RAM to add to my 4x1GB of stock RAM in a 2008 Mac Pro 3,1 with Mavericks 10.9.1. I have 2x2GB in slots 3 and 4 and 2x1GB in slots 1 and 2 for a total of 6GB paired on both upper and lower cards. System Profile shows 10GB of Memory instead of the expected 12GB. When I incorrectly had 4x2GB on top and 4x1GB on bottom, it showed 8GB total, so I am making progress, but how should they be ideally installed to get all 12GB of available usage? BTW, this machine is also running Mavericks Server.
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Question by:MarkJulie
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I found an article that suggested physically removing and replacing the modules a second time without changing their positions. That solved the problem after a reboot.
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