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MP 7,1 Ram: Samsung vs Crucial

chfilm

chfilm

macrumors 68040
Original poster
Nov 15, 2012
3,451
2,133
Berlin
Hey guys,

so I'm looking at either these modules
CRUCIAL 32 GB

or these for 6x32gb.

SAMSUNG 32GB

Any experiences with Crucial vs Samsung? The Samsungs are ridiculously cheap, especially when you regard that a single 16gb stick costs about 90€.
Was thinking to get 6x16 and then upgrade later another 16, but at that price of the samsungs... not sure...

What do you think?
 
I purchased Samsung server pulls (branded as Cisco parts) for MP5,1 and have not had any issues with that RAM. Have 8 x 16GB modules. Have also used Crucial (Micron) for many years without issue. MBP16,1 comes with Micron RAM for 64GB model (2 x 32GB).

Had one Kingston RAM module fail and that's been my only RAM failure issue in the past 7-10 years. Will say, Kington's customer service was phenomenal and sent out a full set of matching replacements overnight.
 
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Thanks guys, I think I'm gonna go with Samsung at this unbelievable price point then.
If you look at the specs, everything looks like it should work, right?
I'm gonna wait with the order though to really catch the 14 days return window, just in case.
 
chfilm said:
Thanks guys, I think I'm gonna go with Samsung at this unbelievable price point then.
If you look at the specs, everything looks like it should work, right?
I'm gonna wait with the order though to really catch the 14 days return window, just in case.
Click to expand...
are you gonna add on to the Apple sticks you have already? or completely replace?
 
Parzival said:
What would the negative result from this be? Lower speed? I wonder how much that would be in practice, like if it is even noticable, outside of benchmarks.
Click to expand...
Yea I can’t answer that but an Apple specialist told me that on the phone.
 
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That Samsung RAM has identical specs to the Micron and SK hynix RAM from Apple (except lower speed, lower latency). I don't see a reason why it wouldn't work.
 
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H. Flower said:
It’s not the same speed as Apples ? Aren’t they both 2933?
Click to expand...

Well, the RAM pictured on Apple's website for the Mac Pro memory kits is 3200MHz, CL22. We can verify what type of RAM the Mac Pro ships with if someone takes a photo of the RAM in their machine. The photo must be clear enough to see the numbers on the individual chips. Apple doesn't have photos of the 64GB and 128GB LRDIMMs so it would be interesting to see those (they are showing photos of the 32 GB RDIMMs for those).
 
MisterAndrew said:
Well, the RAM pictured on Apple's website for the Mac Pro memory kits is 3200MHz, CL22. We can verify what type of RAM the Mac Pro ships with if someone takes a photo of the RAM in their machine. The photo must be clear enough to see the numbers on the individual chips. Apple doesn't have photos of the 64GB and 128GB LRDIMMs so it would be interesting to see those (they are showing photos of the 32 GB RDIMMs for those).
Click to expand...
Would be great if someone could post such a photo! But the official specs state 2933MHz not 3200. It’s the first time I hear this number.
 
chfilm said:
Would be great if someone could post such a photo! But the official specs state 2933MHz not 3200. It’s the first time I hear this number.
Click to expand...

It's been discussed in some other threads, but this forum is so busy it's easy to miss, such as this one where a Twitter user discovered it (and erroneously thought Apple was using cheap high latency RAM): MacPro 7,1 actually using Micron's cheapest Ram: Is this true?

These are the model numbers for the genuine Apple RDIMMs shown on their website for the memory kits. They are 3200MHz, CL22. (Edit: wrong)

Micron: MT40A2G4SA-062E (Edit: may be wrong)

SK hynix: HMA82GR7CJR4N-XN (Edit: wrong)

We haven't yet confirmed if these are the RDIMMs being shipped in Mac Pros. Edit: The Mac Pro ships with 2933MHz RAM. The 8GB RDIMMs are SK hynix HMA81GR7CJR8N-WM. Photo: CdQRVQAPWeHliu1H.huge
 
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MisterAndrew said:
It's been discussed in some other threads, but this forum is so busy it's easy to miss, such as this one where a Twitter user discovered it (and erroneously thought Apple was using cheap high latency RAM): MacPro 7,1 actually using Micron's cheapest Ram: Is this true?

These are the model numbers for the genuine Apple RDIMMs shown on their website for the memory kits. They are 3200MHz, CL22.

Micron: MT40A2G4SA-062E

SK hynix: HMA82GR7CJR4N-XN

We haven't yet confirmed if these are the RDIMMs being shipped in Mac Pros.
Click to expand...
I see, thanks - well... but still, in the official specs it says 2933 MHz, so I assume that’s the correct clock speed...
 
Yes, 3200MHz RAM will be down clocked to either 2933MHz or 2666MHz depending on processor, but that's where the problem lies. The 3200MHz RAM has a higher latency so it will be slower at 2933MHz than CL21 2933MHz RAM (or CL19 2666MHz RAM at 2666MHz). Edit: This is incorrect. Apparently faster RAM will adopt the lower latency at the reduced speed.
 
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MisterAndrew said:
Yes, 3200MHz RAM will be down clocked to either 2933MHz or 2666MHz depending on processor, but that's where the problem lies. The 3200MHz RAM has a higher latency so it will be slower at 2933MHz than CL21 2933MHz RAM (or CL19 2666MHz RAM at 2666MHz).
Click to expand...
So youre saying Apple presumably sells Ram that is too speedy for the new Mac Pro at an extremely overpriced price tag, and if we buy 2933MHz Ram from the street it‘s gonna be the right choice, correct?

I plan on purchasing this model X6:
Samsung M393A4K40CB2-CVF

2 Ranks, 2Gx4 double-sided (36 Chips), 4G x 72
DDR4 ECC Reg
2933 Mhz CL-21 PC4-23400 23,4GB /s
[42,6GB at DUAL CHANNEL]
DIMM (133,35 x 31,25mm), 288 gold covered PINs
CL21 (CL19 bei 2666MHz)

140 € per Dimm, it‘s a real steal!!
 
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aliengirl said:
I *think* this is the correct 64GB RAM from Crucial with 2933 CL21
https://www.crucial.com/usa/en/CT64G4RFD4293
Click to expand...
Maybe. Apple's support doc on memory says:
"Configured from Apple, Mac Pro models include the following DIMM types:
• R-DIMMs for configurations up to 192GB (6x32GB).
• LR-DIMMs for configurations of 384GB (6x64GB) or more."

But... the document also indicates that either can be used although not mixed. So is their configuration method a required one, i.e. from 384 and up use only LR-DIMMs? I suspect so since they would not likely do it otherwise.

So many questions...
 
majus said:
Maybe. Apple's support doc on memory says:
"Configured from Apple, Mac Pro models include the following DIMM types:
• R-DIMMs for configurations up to 192GB (6x32GB).
• LR-DIMMs for configurations of 384GB (6x64GB) or more."

But... the document also indicates that either can be used although not mixed. So is their configuration method a required one, i.e. from 384 and up use only LR-DIMMs? I suspect so since they would not likely do it otherwise.

So many questions...
Click to expand...
Yeah- It seems like crucial is not currently offering a 2933 LRDIMM option. Bummer.
 
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