The Mac Pro First Generation is an Intel Xeon-based workstation computer manufactured by Apple Inc. The first generation model includes the machines from 2006 through 2008.

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Ram upgrade from 4gb to 32gb

I just upgraded my 2006 Mac Pro ram from 4mg to 32mb. The only problem is the computer will not read the lower ram stack. I tried switching the stacks to see if one was not working. but both work in the top slot. When I insert the lower card 4 red lights come on the lower card. What does this mean?

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Are you using 8 identical 4 GB sticks?

RAM Type: PC5300 DDR2 ECC Min. RAM Speed: 667 MHz

Details: Uses "667 MHz DDR2 ECC fully-buffered DIMM (FB-DIMM) memory" with a heatsink design that is a bit different than generic FB-DIMMs and has "up to [a] 256-bit wide memory architecture".

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