MP 7,1 RAM Upgrade

[smckenzie]

I have 96Gb in the 7,1 right now over 12 sticks. Was thinking of upgrading to 128Gb. Looks like I can do it either in 8x16Gb or 4x32Gb. I take it there isn't a performance difference doing it on 4 instead of 8?

 

[mattspace]

Either way, you're straying from the 6 memory channels. With only 4 you're leaving capacity empty and unusable. I'd be tempted to try to stretch for 12x16, or 6x32.

 

[smckenzie]

Not sure what your mean about straying away from six. I read this article and take it 4 is the minimum you can have which is what OWC sell.

Install and replace memory in your Mac Pro (2019) - Apple Support

Learn how to remove and install memory in your Mac Pro.

support.apple.com

 

[mattspace]

Not sure what your mean about straying away from six. I read this article and take it 4 is the minimum you can have which is what OWC sell.

Install and replace memory in your Mac Pro (2019) - Apple Support

Learn how to remove and install memory in your Mac Pro.

support.apple.com

The 7,1 has 6 memory channels, with 4 dimms you're only using a maximum of 2/3 of the throughput.

 

[Regulus67]

It is always best to use whatever is dictated by the memory channels. No difference from PCs.
mattspace is correct. And use DIMMS that are of the same spec, for best results.
I have 6*16GB = 96GB, and 6*32GB = 192GB in my machines.
And I would rather choose 6*64GB = 384GB, over 12*32GB = 384GB, for the same reason

 

[smckenzie]

Thanks for the clarification - I misread a bit on the Apple docs page about for best performance use either 6 or 12 dimms. With that in mind 128Gb wouldn't be possible. Looking at the memory from OWC it would be 6 or 12 for 192Gb which is $430/470+ instead of $299/320 which is a bit more than I was looking to spend.

 

[avro707]

What about using memory.net and going for sk-hynix?

I was looking there recently and prices were decent.

 

[smckenzie]

Looks like $384 from them for 6x32Gb.