MP 7,1 Which 8GB third party ram?

[chfilm]

Hey,

I’d like to get two additional 8GB sticks for the new Mac Pro so I could use my existing 4 dimms in 12 channel mode withmy new 6x32 dimms.

I can’t seem to find any fitting model that matches the required specs and is widely available. Any advice? Did somebody get third party 8GB sticks?
I guess I could wait till the used ones show up on eBay but ..

 

[bxs]

Try here -> https://www.nemixram.com/apple-memo...hQkTU5uTMTRrIBCtCym33vH9qBTxohrRoCnRwQAvD_BwE

 

[DeltaMac]

OWC is (probably) good for that.

2019 Apple Mac Pro Memory Upgrades from OWC

Easily upgrade the memory of your 2019 Apple Mac Pro up to 1.5TB. OWC memory kits are 100% Apple compatible and backed by a lifetime OWC warranty.

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The 32 GB sticks that you have are probably LRDIMMs.
You may be better off by getting another pair of those 32 GB sticks, as mixing RDIMMs and LRDIMMS would drop your memory speed noticeably, from what I have heard.

 

[curmudgeonette]

The 32 GB sticks that you have are probably LRDIMMs.
You may be better off by getting another pair of those 32 GB sticks, as mixing RDIMMs and LRDIMMS would drop your memory speed noticeably, from what I have heard.

Mixing RDIMM and LRDIMM shouldn't work at all, and chfilm did get ten sticks working but at a lower system benchmark, therefore they should all be RDIMMs.

 

[Snow Tiger]

Hey,

I’d like to get two additional 8GB sticks for the new Mac Pro so I could use my existing 4 dimms in 12 channel mode withmy new 6x32 dimms.

I can’t seem to find any fitting model that matches the required specs and is widely available. Any advice? Did somebody get third party 8GB sticks?
I guess I could wait till the used ones show up on eBay but ..

Hynix HMA81GR7CJR8N-WM . For $70 each . These were the 8GB factory modules in my Mac Pro 7,1 .

 

[honestone33]

OWC is (probably) good for that.

2019 Apple Mac Pro Memory Upgrades from OWC

Easily upgrade the memory of your 2019 Apple Mac Pro up to 1.5TB. OWC memory kits are 100% Apple compatible and backed by a lifetime OWC warranty.

eshop.macsales.com

You took the words right out of my mouth! About 3 years ago, I ordered a pair of 4 gig Ram modules for my late 2012 Mac Mini from them (they were on sale), and am very pleased.

 

[chfilm]

Mixing RDIMM and LRDIMM shouldn't work at all, and chfilm did get ten sticks working but at a lower system benchmark, therefore they should all be RDIMMs.

Yea they are RDimms
[automerge]1577921466[/automerge]

Mixing RDIMM and LRDIMM shouldn't work at all, and chfilm did get ten sticks working but at a lower system benchmark, therefore they should all be RDIMMs.

If I have 12 sticks, performance shouldn’t be degraded or?

 

[AidenShaw]

Yea they are RDimms
[automerge]1577921466[/automerge]

If I have 12 sticks, performance shouldn’t be degraded or?

12 DIMMs of the same size and technology is optimum for that technology.

I've never understood why people use the term "sticks" to refer to "DIMMs".

Stick:

 

[chfilm]

12 DIMMs of the same size and technology is optimum for that technology. (I've never understood why people use the term "sticks" to refer to "DIMMs".)

6 would be 32gb and the other 6 would be 8. What do you think about how the performance would be in that scenario?

with 10 sticks (6x32 and 4x8) it was seriously degraded in Multicore geekbench. 8 sticks I couldn’t even get to work..

 

[AidenShaw]

6 would be 32gb and the other 6 would be 8. What do you think about how the performance would be in that scenario?

with 10 sticks (6x32 and 4x8) it was seriously degraded in Multicore geekbench. 8 sticks I couldn’t even get to work..

If the six 32 GiB DIMMs are on one memory controller, and the six 8 GiB DIMMs are on the other, it should be fine. Best not to mix sizes on a controller. All should be RDIMMs or LRDIMMs - don't mix them.

<pedantic>Note that "32gb" is "3.725 GiB".

"b" is bits, "B" is bytes. "G" or "g" is 10^9. "Gi" is 2^30.</pedantic>

 

[Snow Tiger]

12 DIMMs of the same size and technology is optimum for that technology.

I've never understood why people use the term "sticks" to refer to "DIMMs".

Stick:
View attachment 886152

Aiden , I've never met any one that said , "Hey , pass me that DIMM ." Not in half a century .

 

[chfilm]

If the six 32 GiB DIMMs are on one memory controller, and the six 8 GiB DIMMs are on the other, it should be fine. Best not to mix sizes on a controller. All should be RDIMMs or LRDIMMs - don't mix them.

<pedantic>Note that "32gb" is "3.725 GiB".

"b" is bits, "B" is bytes. "G" or "g" is 10^9. "Gi" is 2^30.</pedantic>

Thanks Aiden! Really appreciate it!
Do we understand what channels are on what controller? I don’t really trust the Apple documentation anymore since it was completely misleading for when I was installing the 8 and 10 DIMMS.

 

[majus]

I've never understood why people use the term "sticks" to refer to "DIMMs".

I'm pretty sure they were being called that when I had my first machine (an IBM-XT) in the distant past when the stars were still young. Since it's just an informal or slang term, maybe it came into use because you had to stick it into a socket instead of soldering it.

 

[AidenShaw]

Aiden , I've never met any one that said , "Hey , pass me that DIMM ." Not in half a century .

Since DIMMs arrived around 1993, I'll call BS on your "half a century" claim.

 

[chfilm]

Since DIMMs arrived around 1993, I'll call BS on your "half a century" claim.

I'll ask again Do we know which channels belong to which controller?

 

[Korican100]

Thanks Aiden! Really appreciate it!
Do we understand what channels are on what controller? I don’t really trust the Apple documentation anymore since it was completely misleading for when I was installing the 8 and 10 DIMMS.

if im not mistaken, the first 6 specified slots belong to one channel, and the rest are for the other controller

 

[Snow Tiger]

Since DIMMs arrived around 1993, I'll call BS on your "half a century" claim.

Darn , I just knew some one would get all technical on me . I don't remember when DIMMs actually came into existence , either . But everyone called them memory sticks , starting around the mid 1980s with the Macintosh II line of 'puters . To my credit , in writing I call them memory modules . A fellow has to have his dignity , after all ...

 

[chfilm]

Darn , I just knew some one would get all technical on me . I don't remember when DIMMs actually came into existence , either . But everyone called them memory sticks , starting around the mid 1980s with the Macintosh II line of 'puters . To my credit , in writing I call them memory modules . A fellow has to have his dignity , after all ...

And we call them RAM RIEGEL in Germany lol, so 🤪

 

[Snow Tiger]

if im not mistaken, the first 6 specified slots belong to one channel, and the rest are for the other controller

The Single Processor LGA 3647 Cascade Lake Xeon System ( Like a MP7,1 ) has two memory controllers , six memory channels and can address two memory sticks DIMMs per channel . Each channel can be determined by this chart lovingly provided by our dear friends from the Spaceship :

 

[Korican100]

The Single Processor LGA 3647 Cascade Lake Xeon System ( Like a MP7,1 ) has two memory controllers , six memory channels and can address two memory sticks DIMMs per channel . Each channel can be determined by this chart lovingly provided by our dear friends from the Spaceship :


View attachment 886167

so memory controller one would take the first 6 sticks on 1, 2, and 3. Then, memory controller two would take the other 6 sticks on 4, 5, and 6. But slots 123 should be same capacity for optimal performance, and 456 as well?

 

[Snow Tiger]

so memory controller one would take the first 6 sticks on 1, 2, and 3. Then, memory controller two would take the other 6 sticks on 4, 5, and 6. But slots 123 should be same capacity for optimal performance, and 456 as well?

I'm not certain . Apple probably ships the MP7,1 only with matching memory modules . That includes size . Companies like Supermicro , which manufacturer logic boards with LGA 3647 sockets , say all the memory modules must match in a System . I suspect they are worried about some otherwise similar modules having different timings , etc , that might drag System performance down to the lowest common denominator .

 

[DoofenshmirtzEI]

I'm pretty sure they were being called that when I had my first machine (an IBM-XT) in the distant past when the stars were still young. Since it's just an informal or slang term, maybe it came into use because you had to stick it into a socket instead of soldering it.

I don't recall ever referring to IBM XT (or PC or AT) memory as "sticks" (back then it was individual chips that you had to insert/remove manually from the motherboard or expansion card). I've always thought the "stick" reference was because a "stick" of memory resembles a "stick" of gum. It's been "stick" ever since the "expansion cards" shrank sufficiently to bring a "stick of gum" to mind.

 

[tommy chen]

like it was the rule at the old cMP:
NEVER MIX ANY DIMMS or you're in trouble

 

[majus]

I don't recall ever referring to IBM XT (or PC or AT) memory as "sticks" (back then it was individual chips that you had to insert/remove manually from the motherboard or expansion card). I've always thought the "stick" reference was because a "stick" of memory resembles a "stick" of gum. It's been "stick" ever since the "expansion cards" shrank sufficiently to bring a "stick of gum" to mind.

You are right. I just found a YouTube video of a guy updating an XT with more memory and it was indeed chips. So I can put that into the record books as my first mistake of 2020! I'm blaming it on defective memory.