Lay your Mac Pro down on a soft, clean cloth on the desk or work surface to avoid scratching the work surface or your Mac Pro. Reinstall each memory card, pushing it straight down until it's. ![]() > > > MacBook Pro Models The actual maximum RAM of each MacBook Pro is listed below along with its compatible RAM type, default amount of RAM pre-installed, common identifiers suitable to identify a MacBook Pro in order to determine its RAM capacity, and more. If you are not sure which MacBook Pro you have, and the Model Identifier and EMC Number below are not sufficient for identification, you also may look it up with other identifiers -- including its Serial Number -- with EveryMac.com's feature and the. If you need more help, refer to. If you find this page useful, please it. Click the triangle to the left of a system to open 'Quick Specs' -- the two most relevant identifiers for RAM capacity, full RAM details and links to buy compatible RAM from site sponsors -- and click on the name or image for complete specifications. Asterisks indicate important details (such as a different 'official' maximum RAM capacity listed within 'Quick Specs' or other details on the complete specs page). Note that 'Retina' MacBook Pro models (2012 to Present) cannot have the RAM upgraded at all after purchase. I have a MacPro5,1 with 8 cores (2 quad-core processors) running OS X 10.10.2. From what I have read as per it should be possible to have far beyond the normal maximum noted by Apple: Actual Maximum RAM. Systems with dual processors, which EveryMac.com notes as the 'Eight Core' and 'Twelve Core' models, likewise officially support 32 GB of RAM, but again, OWC found they actually can support more. OWC first confirmed an actual maximum of 64 GB of RAM running Mac OS X 10.5 'Leopard' and later increased this maximum to 96 GB of RAM running Mac OS X 10.6 'Snow Leopard' or higher. More recently, OWC yet again discovered these dual processor models can support up 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. I initially had an arrangement of 8 4GB DIMMs. These brought my system up to 32GB. I then purchased 2 16GB chips in hopes to raise the amount of RAM, however my system would simply not start up at all. Gave a fast power LED blink. I subsequently returned this RAM and acquired 4 8GB DIMMs. Upon installing these, my system still shows 32GB of RAM, but the 7 & 8 DIMM slots are showing empty now at this point. Two of the DIMMS are being recognized while the others are not, even though there are 4 GB DIMMs in place and 4 4GB DIMMS: What kind of issue is going on here? Obviously we're getting mixed messages with the info above about being able to accept much larger memory configurations, but in practice things get quite whacky. That machine will take 16's - my 3,1 does, to an unofficial maximum of 64GB [or more, according to Everymac, though I've not tested that myself]. The arrangement is not what you would initially think logical. • If you install equal-size DIMMs (for example, all 1 or 2 GB DIMMs) in your Mac Pro, Apple recommends that you fill the slots in the order listed in the table. Note: If you install different-size DIMMs in your Mac Pro, follow the order in the table. If the DIMM configuration you install doesn't provide optimized performance, the Memory Slot Utility appears onscreen and recommends an improved configuration. Source: & previous similar confusion when I upgraded mine;). Okay, so ultimately there are some specific requirements that the Mac Pro has in terms of where you stick the 8GB DIMMs. I am curious as to whether or not that could have had bearing on the 16GB DIMM issue wherein the system would simply not start up, but I wanted to at least share the ultimate configuration that worked after a couple of iterations (since the RAM simply was not appearing initially a few attempts had to be made) from from the suggestions of /System/Library/CoreServices/Memory Slot Utility.app.
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