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I am a System Builder with fifteen year's experience building workstations that are deployed in production environments. And he is a smart cookie that I trust as well. I'm not certain if tsialex is a trained engineer or a self taught one. It's just that not enough of them can be installed to obtain the best bandwidth here. It's not that quad rank modules are somehow inferior. That is the reason quad rank memory in a cMP can never activate the Nehalem processor's tri channel memory bandwidth optimization. It is not possible with this platform to install three matching quad rank memory modules, as they would need to consume twelve rank positions. It is possible with this platform to install three matching dual rank memory modules, as they would consume only six rank positions.

The bank will accept a total of 8 rank positions for all the installed modules. The UP cMP 5,1 only has a single bank of four memory slots. If you were to closely examine the module model I recommended to the OP, they are dual rank.

You are welcome to your opinion I will trust his over yours." With all the guides he has posted on the inner workings of these machines and his abilities to redo the chips on the logic board. That man knows more than most apple engineers I think or at least as much. Model ID: iMac11,2 iMac11,3 Click here to find your Model ID. I will go with what he said in that thread I first saw this in as to why the OP could not get the rated 1333mhz speed. MacBook Pro Memory RAM iMac Memory RAM Mac Mini Memory RAM Mac Pro Memory RAM iMac Pro Memory RAM Macbook Memory RAM Keyboards & Mice.

All OWC brand memory is thoroughly tested and assured to perform flawlessly and is covered by a Lifetime Advance Replacement Warranty and a Money-Back Guarantee."It is well known according to tsialex that quad ranked modules do not give the top speed. We also provide expert technical support to assist you if any issues arise. To make memory installation as stress-free and straightforward as possible, we offer step-by-step installation videos to walk users through the upgrade process.

Since 1988, OWC has specialized in 100% Apple-compatible memory upgrades for nearly any Mac. As far as MacBook Air, it is impossible to upgrade the RAM of any model since it is soldered directly to the board to make them thinner and lighter. You can upgrade all Intel Mac mini desktops except for models released between 2014 - 2017 (Macmini7,1) and M1 Mac mini models (Macmini9,1). No MacBook Pro models with “Retina Display” or “Touch Bar” can be upgraded. Although you can upgrade the memory of any 27-inch iMac or Mac Pro, the only MacBook Pro models that are upgradeable are non-retina models released up to 2016.