Can I Upgrade up to 12GB?

[agtoau]

When did I say that? I am only saying that if your work needs 32GB RAM, then Apple laptops are probably not for you. There is a number of companies selling workstation machines, why not look there? Different usages, different tools.

As a pro photographer, I would love a 32GB MacBook Pro as a possible alternative to a Mac Pro.

 

[disasterdrone]

I am only saying that if your work needs 32GB RAM, then Apple laptops are probably not for you. There is a number of companies selling workstation machines, why not look there? Different usages, different tools.

Obviously, because of OSX.
The need for large ram and storage capacity has nothing to do with OS needs - there's simply no relationship between what OS someone wants to use and whether they use their machine for heavy duty media work.

 

[drambuie]

Do you mean "lower 8GB" as in the memory controller will prioritize the 8GB module? Does it have to be in slot 0 for that? Or do you mean the lower 8GB addressable, which could be 4GB in the 4GB module and 4GB in the 8GB module IF it prioritizes the 4GB module, which may be slot-dependant???

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Yep, which makes development of 16GB slot-in modules (even) more unlikely.

Yes, you have it correct in your second case. In this configuration the lower 4GB of the 8GB DIMM and the 4GB DIMM would operate in dual channel mode. The upper 4GB in the 8GB DIMM would operate in single channel mode. This flexibility has been included in Intel memory controllers since the introduction of dual channel.

This is easy in an MBP that will accept 16GB as there are only two slots. For an iMac, the two DIMMs would need to be in alternate memory slots to work as above. If you place them in adjacent slots, all 12GB will be single channel.

 

[simonsi]

Yes, you have it correct in your second case. In this configuration the lower 4GB of the 8GB DIMM and the 4GB DIMM would operate in dual channel mode. The upper 4GB in the 8GB DIMM would operate in single channel mode. This flexibility has been included in Intel memory controllers since the introduction of dual channel.

This is easy in an MBP that will accept 16GB as there are only two slots. For an iMac, the two DIMMs would need to be in alternate memory slots to work as above. If you place them in adjacent slots, all 12GB will be single channel.

Thanks for clarifying