Hello to all !
I will tell my story "as is" and ask you to help me.
I have a MacPro 5.1 average 2012.
2 X Xeon 3.46 GHz (2 X x5690) (was upgraded)
32gb memory
I decided to improve the memory and bought 128gb of memory:
8 x 16gb type HMT 42GR7AFR4A-H9 T3 AD 1426 (HP P11X6J4)
But this memory does not work if you put all 8 modules. Sometimes the computer does not start, sometimes it starts and hangs immediately, sometimes it hangs after a few seconds. Sometimes the red LED on the processor board lights up.
I started the experiment and found out that it can work only together with 96gb of this particular memory and only when slots 1 and 5 are free. Only in this case the computer works perfectly.
I asked my friend to try putting this memory kit into his computer (2 x Xeon 2.4 GHz) and everything worked fine for him.
I searched for information for a long time and found this post (by MisterAndrew):
It turns out that in my case I need a memory of this type:
forums.macrumors.com
I also asked for advice from OWC and received an answer that this memory is suitable for my case (I indicated that I have 2 X 3.46 eg 2 X x5690, but maybe they did not pay attention to it):
eshop.macsales.com
I understand that my new 128gb is not suitable (more precisely, if you use only 96gb of them).
Question: Why is my new memory not working? What is important?
my "new" memory: DDR3-1333 ECC-Registered PC3L-12800 and Cas Latency CL9 1.35 V
memory.net
as written in the post - DDR3-1333 ECC-Registered PC3L-12800 and Cas Latency CL11 1.35 V
memory.net
in the case of OWC - memory DDR3-1333 ECC-Registered PC-10600 and CAS 9-9-9-24 1.5 V
eshop.macsales.com
Which parameters are decisive? Why does the post indicate PC3L-12800 memory for a processor that needs PC-10660 memory? (and it is indicated that it will still work at 1333 MHz, but 1600 MHz is needed)? For what reason will it work?
Is something related to the three memory channels here? Why does my "new" memory only work if there are three modules for one processor? Maybe this is the reason?
Is the Cas Latency parameter important in my case? What is important?
Is it possible to use any other memory? What exact parameters should I choose?
PS. I understand that the question is very delicate and there are few answers to it. I understand that probably few have done such experiments. But I hope that I will find the correct answers and understand why these answers are correct.
Thank you all in advance for your answers!
I will tell my story "as is" and ask you to help me.
I have a MacPro 5.1 average 2012.
2 X Xeon 3.46 GHz (2 X x5690) (was upgraded)
32gb memory
I decided to improve the memory and bought 128gb of memory:
8 x 16gb type HMT 42GR7AFR4A-H9 T3 AD 1426 (HP P11X6J4)
But this memory does not work if you put all 8 modules. Sometimes the computer does not start, sometimes it starts and hangs immediately, sometimes it hangs after a few seconds. Sometimes the red LED on the processor board lights up.
I started the experiment and found out that it can work only together with 96gb of this particular memory and only when slots 1 and 5 are free. Only in this case the computer works perfectly.
I asked my friend to try putting this memory kit into his computer (2 x Xeon 2.4 GHz) and everything worked fine for him.
I searched for information for a long time and found this post (by MisterAndrew):
It turns out that in my case I need a memory of this type:
Mac Pro RAM Compatibility List
Mac Pro RAM Compatibility List This thread has information on the specifications of RAM for the Mac Pro models to help you determine compatibility. This is a Wiki post so anyone with the appropriate permissions may edit it. Please help others in the community by adding compatible RAM and fixing...
forums.macrumors.com
I also asked for advice from OWC and received an answer that this memory is suitable for my case (I indicated that I have 2 X 3.46 eg 2 X x5690, but maybe they did not pay attention to it):
128.0GB Memory Upgrade for 2009-2012 Apple Mac Pro Tower
Upgrade your 2009-2012 Mac Pro to 128GB of RAM, and save money by trading in the original memory chips. Includes an OWC lifetime warranty.
eshop.macsales.com
I understand that my new 128gb is not suitable (more precisely, if you use only 96gb of them).
Question: Why is my new memory not working? What is important?
my "new" memory: DDR3-1333 ECC-Registered PC3L-12800 and Cas Latency CL9 1.35 V
HMT42GR7AFR4A-H9 - SK HYNIX 1x 16GB DDR3-1333 RDIMM PC3L-10600R Dual Rank x4 Module
Get ➡️ Lifetime warranty ✅ Great savings ✅ Buy factory original HMT42GR7AFR4A-H9 - SK HYNIX 1x 16GB DDR3-1333 RDIMM PC3L-10600R Dual Rank x4 Modules @Memory.NET!
memory.net
as written in the post - DDR3-1333 ECC-Registered PC3L-12800 and Cas Latency CL11 1.35 V
M393B2G70DB0-YK0 - Samsung 1x 16GB DDR3-1600 RDIMM PC3L-12800R Dual Rank x4 Module
Get ➡️ Lifetime warranty ✅ Great savings ✅ Buy factory original M393B2G70DB0-YK0 - Samsung 1x 16GB DDR3-1600 RDIMM PC3L-12800R Dual Rank x4 Modules @Memory.NET!
memory.net
in the case of OWC - memory DDR3-1333 ECC-Registered PC-10600 and CAS 9-9-9-24 1.5 V
128.0GB Memory Upgrade for 2009-2012 Apple Mac Pro Tower
Upgrade your 2009-2012 Mac Pro to 128GB of RAM, and save money by trading in the original memory chips. Includes an OWC lifetime warranty.
eshop.macsales.com
Which parameters are decisive? Why does the post indicate PC3L-12800 memory for a processor that needs PC-10660 memory? (and it is indicated that it will still work at 1333 MHz, but 1600 MHz is needed)? For what reason will it work?
Is something related to the three memory channels here? Why does my "new" memory only work if there are three modules for one processor? Maybe this is the reason?
Is the Cas Latency parameter important in my case? What is important?
Is it possible to use any other memory? What exact parameters should I choose?
PS. I understand that the question is very delicate and there are few answers to it. I understand that probably few have done such experiments. But I hope that I will find the correct answers and understand why these answers are correct.
Thank you all in advance for your answers!