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memory raiser

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    MP 1,1-5,1 Mac Pro 1,1 not recognizing RAM on DIMM2 and DIMM4 on raiser A

    I have a Mac Pro 1,1 -> 2,1 with 8x4GB ram sticks. As it’s usual for these machines I tried to swap them between raisers, slots, etc and consistently the raiser A (the top one) keeps not recognizing any RAM in both DIMM2 and DIMM4. While the same configuration in the raiser B is always fully...