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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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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.

2008 Mac Pro RAM upgrade configuration

All of Apple's hardware is produced solely by Apple Inc., who determines internal systems, designs, and prices. Apple buys certain components wholesale from third-party manufacturers. The current Mac product family uses Intel x86-64 processors. All Mac models ship with at least 1 GB RAM as standard. Current Mac computers use ATI Radeon or nVidia GeForce graphics cards and include a dual-function DVD and CD burner, called the SuperDrive. Current Apple hardware includes the iPad, iPhone, iMac, Mac Pro, Macbook, iPod and Apple TV. Discontinued hardware includes the Apple I, Apple II, and the Apple III, the Lisa, the Newton, the Quadra, Performa, Centris, Macintosh II and LC series, the Power Macintosh, iBooks and the MacBook.

Apple Hardware

Apple's early computers ran on a variety of operating systems, including a Pascal version and one based on CP/M, before releasing its ProDOS with the advent of its 16-bit computer. With the release of the Lisa, which had its own OS, Apple and computing entered the graphical age; it was followed by the Macintosh, which offered a series of "System" operating systems. Other Mac operating systems included PowerPC until Apple acquired NeXT and folded it into the Mac OS. Current operating systems for Apple devices are Mac OS-X and iOS.