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The Early 2009 Mac Pro—also known as the Mac Pro 4,1—introduced Intel's Nehalem architecture to Apple's line of professional desktop computers in March 2009. The Mac Pro 5,1 used the same interior design but received further CPU updates in 2010 and 2012.

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Mac Pro 5.1 what is max RAM?

Hi guys,

what is max RAM what can be used in MP 5.1 ? spec below:

CPU 2x2.4GHz Xeon X5620

Boot ROM MB51.0089.B00

macOS High Sierra

Thanks a lot.

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128 GB (only with dual Xeon)

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So why the one what I have now wont accept more than 64GB ? If I use more than 64GB it’s booting but somewhere in the middle of bar loading I get white screen with cross circle (like no boot HDD).

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MaPro 5,1

I suspect you need Mojave, otherwise you are limited to 96GB due to firmware.

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@danj will check, thanks.

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@danj so not sure where was problem, but I had RAID 0 with Genuine Apple RAID card, so I took it out, made fresh install macOS High Sierra and all good. Picture on top (can I add picture to comment or only to answer ?)

Do you thing that RAID card can be issue with 128GB of RAM ?

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@roboscrap - That might be an issue. Did you put the RAID bd in yet?

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Pre-Installed MacOS: X 10.6.4 (10F2521) Maximum MacOS: X 10.14.x*

Standard RAM:6 GBMaximum RAM:128 GB*

Details:By default, 6 GB of RAM is installed as six 1 GB modules. Two slots free.

*Apple officially supports 32 GB of RAM in this model, but as first notedby OWC, it actually could support 64 GB of RAM. Later, OWC bumped this unofficial maximum RAM to 96 GB running Mac OS X 10.6 or 10.7, and yet again to 128 GB, but only when running a 64-bit version of Windows XP or later or Linux. Mac OS X only can support 96 GB of RAM.

RAM Type:PC3-8500 DDR3 ECCMin. RAM Speed:1066 MHz

Details:Uses "1066 MHz DDR3 ECC SDRAM" (PC3-8500) modules.

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I am afraid that https://everymac.com/ didn’t update there page’s as last informations are about Mac OS X 10.7/10.7, but for macOS 10.13 it’s working :)

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