The power supply isn’t having any issues.Riser cards and surrounding area must be free of dust.Make sure the riser boards are snugly plugged into their slots, fully in.Make sure all the RAM is seated in place.The 5000X memory controller chipset has a TDP Max of 32.4W, a maximum memory bandwidth of 21 GB/s, natively supports 533 MHz and 667 MHz memory, has 4 total channels (2 riser cards with 2x dual channel pairs each), is of the PCIe v1.1 revision (this means these Mac Pros have PCIe v1.1, not v1.0!), and has a maximum temperature tolerance of 105☌.īefore Diagnosing Your Mac Pro 1,1/2,1 RAM, Remember:.It is the PCIe/RAM memory controller for your Mac Pro it’s an integrated Intel component on your logic board.Since you will be booting into a 64-bit Kernel on a 64-bit OS as of Mac OS X 10.8 and later, the RAM ceiling is lifted to the maximum that the Intel 5000X chipset memory controller can handle- 64 GB of RAM. Since the Mac Pro 1,1 and 2,1 are fully 64-bit computers, merely fitted with a 32-bit EFI, they’re totally capable of booting into a 64-bit-clean OS, which is why a modified Boot.efi file works as a workaround. The changes reflected in Mac OS X 10.8 Mountain Lion and above, are from the kernel the Mac Pro boots into. This strongly depends on your operating system.How Much RAM Can My Mac Pro 1,1/2,1 Handle? An 8×8 GB config (8 of these) is the maximum memory a Mac Pro 1,1 or 2,1 is capable of using. Pictured here, is an 8 GB PC2-5300f 667 MHz DDR2 SDRAM FB-DIMM.
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