Unsolved
173 Posts
0
586
Best Memory for a T7910
I've just installed dual E5-2699A v4 CPUs in my machine. It benchmarks pretty well, but the memory is slow. I think I messed up in that I bought 64Gb of memory, but in 16Gb sticks, so that I only have 4 sticks, 2 per CPU, for dual channel rather than quad. So I bit the bullet and bought more RAM. Still the numbers (latency, read speed, write speed, as measured by passmark) on my ram seem to be very slow compared to some of the memory listed on the passmark site.
I think I need DDR4, 2400T, ECC, Registered. My understanding is that I could use LRDIMM or RDIMM, but I have to be consistent. I understand that 2Rx8 is better than 1Rx16. The passmark has thousands of brands and models of memory, but doesn't allow one to focus on only memory meeting one's specs.
Has anyone looked into what the fastest and and most reliable memory is? I mean, I have zippy CPUs, I should have memory that at least holds its own. Thanks.
WizardOfBoz2
173 Posts
1
January 6th, 2021 05:00
Bump. No one has done any research on optimal memory? Please help if you've found a brand and model that performs well. Thanks!
SkipperSteve
1 Rookie
1 Rookie
•
3 Posts
1
December 8th, 2022 19:00
Hey WizardofBoz2 -
It looks like no one ever responded. : (
Since this thread started almost 2 years ago, I'm guessing you figured something out. I'm looking to buy a T7910 with dual E5-2699A v3 CPUs and I'm going upgrade the RAM first thing since it only comes with 32GB (2x16 2133 DDR4 ECC RDIMM).
What did you find out about different RAM configurations and what did you ultimately go with?
Also, I note that you mentioned that you installed dual E5-2699A v4 CPUs. The system I am looking at comes with the same CPU but v3, which is same max frequency but only 18 cores and 45MB cache vs. 22 cores and 55MB cache, plus the v4 supports 2400 MHz RAM, the v3 is limited to 2133 MHz.
Does the T7910 motherboard even support 2400 MHz RAM?
I look forward to hearing about what you came up with.
Thank you..
HAPPY HOLIDAYS!
WizardOfBoz2
173 Posts
1
December 9th, 2022 05:00
@SkipperSteve, I have 2400MHz DDR4 memory. 8 sticks of 16Gb each. Now, here's the thing. In Windows there are convenient apps that tell you what speed the memory actually is running at. It may be that my machine IS running memory at 2400MHz. But the different ways of getting info on this in Ubuntu are not (IMHO) definitive. dmidecode, lshw, lspci.... Anyway with lshw I get 16 listings of memory for 8 sticks. Every other listing says 2400. In dmidecode, every other listing says 2400MHz for "Speed". But there are 8 other listings (every other one) that have "unknown" for "Configured Memory Speed". So... I think I have 2400MHz? The spec sheet says that the system can handle the 2400MHz, so again, I think that's what I have. Good luck with your system.
WizardOfBoz2
173 Posts
1
December 10th, 2022 09:00
@SkipperSteve I figured it out. There are 16 slots available. I have 8 filled. I had thought that the system was reading each mem stick twice and telling me "2400 Mhz" for the first read and "Unknown" for the second one. I was mistaken: the "unknown" values were from slots not occupied. Doh.
Rikorg
1 Rookie
1 Rookie
•
14 Posts
0
June 13th, 2024 20:59
@ MagoDeBoz2 Yo estoy queriendo probar 8 x 16GB ECC SAMSUNG 2933, pero no me acabo de decidir porque tengo 128GB en 16 x 8GB 2133 y no sé si voy a obtener beneficios apreciables. El coste de los 8 x 16GB, que son PC4 2933, es de 175€. Lo pensaré más. Tengo instalados 2 x E5 2697A v4 y solo funcionaría la RAM a 2400, aunquwe los núevos módulos sean PC4 2933.
(edited)