Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.

Anand Vyas

macrumors newbie
Original poster
Sep 20, 2020
14
2
Hello everyone, I have an issue. I bought the 8 core Mac Pro with the intent of one day upgrading the CPU and also I read this line "All memory included with your Mac Pro is 2933MHz. Mac Pro models with 8 core processors operate memory at 2666MHz" from this Apple Link https://support.apple.com/en-us/HT210405. So to my surprise on https://everymac.com/actual-maximum-mac-ram/actual-maximum-mac-pro-ram-capacity.html it clearly shows that the 8 core model ships with 288-pin PC21300 DDR4 LRDIMM memory module which run at max speed of 2666. My question is this, am I missing something or should I return this machine (I have one day left) and get the 12 core Mac to get the faster memory? Also is this false advertising? I wanted the memory I paid for (equal to all the models) to be the same memory as promised.
 

Anand Vyas

macrumors newbie
Original poster
Sep 20, 2020
14
2
As it was explained to me, Apple only uses 2933Mhz RAM in the 7,1.

With the 8-core your DIMMs are limited to 2666Mhz by the CPU (because that’s all it supports), but install a beefier CPU and they’ll run at the full 2933Mhz.
So is this a lie? https://everymac.com/systems/apple/...on-w-silver-tower-workstation-2019-specs.html
*Apple reports that the Mac Pro (2019) models support "2666 MHz" DDR4 ECC memory. More specifically, this model uses 288-pin PC21300 DDR4 LRDIMM memory modules.
Thanks for you help
 

Anand Vyas

macrumors newbie
Original poster
Sep 20, 2020
14
2
As it was explained to me, Apple only uses 2933Mhz RAM in the 7,1.

With the 8-core your DIMMs are limited to 2666Mhz by the CPU (because that’s all it supports), but install a beefier CPU and they’ll run at the full 2933Mhz.
And for 12 core and above https://everymac.com/systems/apple/...on-w-silver-tower-workstation-2019-specs.html
Apple reports that the Mac Pro (2019) models support "2933 MHz" DDR4 ECC memory. More specifically, this model uses 288-pin PC23400 DDR4 LRDIMM memory modules.
 

Anand Vyas

macrumors newbie
Original poster
Sep 20, 2020
14
2
According to the tech specs on the Apple Store app, the 8 core uses 2666 memory and the higher cores uses 2933. The links you reference also state this. Where did you read anything that states anything different?
Please read just below where it states what they all ship with https://support.apple.com/en-us/HT210405
"All memory included with your Mac Pro is 2933MHz. Mac Pro models with 8 core processors operate memory at 2666MHz." I am asking why mine "Shipped" with the slower memory according to https://everymac.com/systems/apple/...on-w-silver-tower-workstation-2019-specs.html
 

bhmm

macrumors newbie
Mar 18, 2018
16
-1
Please read just below where it states what they all ship with https://support.apple.com/en-us/HT210405
"All memory included with your Mac Pro is 2933MHz. Mac Pro models with 8 core processors operate memory at 2666MHz." I am asking why mine "Shipped" with the slower memory according to https://everymac.com/systems/apple/...on-w-silver-tower-workstation-2019-specs.html

Why not call them if you ordered something and it's not what you were wanting? As either way, you should be able to confirm it directly from Apple and then it is on record before it's too late to return/exchange it for what you wanted (if it isn't what you wanted.)
 

flowrider

macrumors 604
Nov 23, 2012
7,323
3,003
OK - Chill. I also have an 8 core machine. I just went into "System Information" and pulled the PN of the 8GB modules installed. It was HMA81GR7CJR8N-WM. I then went to a couple of vendor sites with the PN. They all show:

TinyGrab Screen Shot 9-20-20, 7.30.34 PM.png


Lou
 

Grumply

macrumors 6502
Feb 24, 2017
285
194
Melbourne, Australia
So is this a lie? https://everymac.com/systems/apple/...on-w-silver-tower-workstation-2019-specs.html
*Apple reports that the Mac Pro (2019) models support "2666 MHz" DDR4 ECC memory. More specifically, this model uses 288-pin PC21300 DDR4 LRDIMM memory modules.
Thanks for you help

Lou's already proved it in his post above, but there's also nothing in the language everymac.com have used that says that the DIMMs themselves are 2666Mhz, just that the CPU only supports 2666Mhz (which is pretty clearly explained everywhere).

So it's not a lie, just vague wording.
 

Anand Vyas

macrumors newbie
Original poster
Sep 20, 2020
14
2
OK - Chill. I also have an 8 core machine. I just went into "System Information" and pulled the PN of the 8GB modules installed. It was HMA81GR7CJR8N-WM. I then went to a couple of vendor sites with the PN. They all show:

View attachment 956530

Lou
Thank you so much!!!
[automerge]1600657271[/automerge]
Lou's already proved it in his post above, but there's also nothing in the language everymac.com have used that says that the DIMMs themselves are 2666Mhz, just that the CPU only supports 2666Mhz (which is pretty clearly explained everywhere).

So it's not a lie, just vague wording.
I should have pulled mine - thank you all for the help. I understand the CPU supports the lower number
 
Last edited:

startergo

macrumors 603
Sep 20, 2018
5,022
2,283
1600685354371.png

1600689399029.png

 
Last edited:

flyproductions

macrumors 65816
Jan 17, 2014
1,086
461
Aside of all that's written, you will never notice any difference in performance between memory running @2666 or @2933MHz. Most likely you will not even be able to measure any using benchmarks.
 
Last edited:

Grumply

macrumors 6502
Feb 24, 2017
285
194
Melbourne, Australia
View attachment 956724

Que? ?

I don't understand why you're posting these up. The OP's question has already been answered - the 8-core ships with 2933Mhz RAM (like all the other versions), it's only the CPU that limits the DIMMs to 2666Mhz. Upgrade the CPU, you get more out of the DIMMs.
 

startergo

macrumors 603
Sep 20, 2018
5,022
2,283
Que? ?

I don't understand why you're posting these up. The OP's question has already been answered - the 8-core ships with 2933Mhz RAM (like all the other versions), it's only the CPU that limits the DIMMs to 2666Mhz. Upgrade the CPU, you get more out of the DIMMs.
That is what I meant. I don't understand why you did circle the 2933Mhz. Sorry for misunderstanding.
 
  • Like
Reactions: Grumply

mBox

macrumors 68020
Jun 26, 2002
2,363
86
Purchased my RAM from Canadaram.com up here in the great white north.
They were great at sorting out specifics with our Mac Pros.
Gave a 16-core 96GB 2933 DDR4s and an 8-core 96GB 2666 DDR4s.
I get the confusion cause you dont want to screw up RAM with these babies :)
 
  • Like
Reactions: Anand Vyas

Anand Vyas

macrumors newbie
Original poster
Sep 20, 2020
14
2
The data in chart is clear. He should asap return to Apple and get proper Mac Pro 7,1 and higher core CPU for his current and future need.
Ok thank you - yet my physical DIMMS show a part number that is 2933
 
Last edited:

Anand Vyas

macrumors newbie
Original poster
Sep 20, 2020
14
2
Aside of all that's written, you will never notice any difference in performance between memory running @2666 or @2933MHz. Most likely you will not even be able to measure any using benchmarks.
Well I know that yet I want to know what I have.
 

Anand Vyas

macrumors newbie
Original poster
Sep 20, 2020
14
2
Purchased my RAM from Canadaram.com up here in the great white north.
They were great at sorting out specifics with our Mac Pros.
Gave a 16-core 96GB 2933 DDR4s and an 8-core 96GB 2666 DDR4s.
I get the confusion cause you dont want to screw up RAM with these babies :)
Thanks for understanding!
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.