Slow RAM write/read/copy/latency

[Dafadau]

Am struggling with a mem issues with my new build. Basically, AIDA64 is giving very slow mem speeds and latency: Mem read: 68344 ; Mem write: 82664; Mem copy: 69897; Mem latency: 103.2ms.

Please would anyone have any ideas?

Build details:

Threadripper 1950X || Titan X (Pascal) || Asus ROG Zenith Extreme || 32gb @ 3000 || Samsung 960 Pro 2TB, 2x Samsung 960 Pro 2TB, Samsung 850 Evo 4TB || BeQuiet Darkbase 900 Pro || Corsair H115 AIO || Corsair RM850i PSU|| AOC AGON AG352UCG 21:9 monitor

Mem details: Vengeance LPX 32GB (4x8GB) DDR4 DRAM 3000MHz C15 Memory Kit - Black (CMK32GX4M4C3000C15)

[JHR1979]

Sounds normal, Got just the trial version of AIDA, its giving mem read 75200 and latency 92,2. (in the default crative/uma mode, not bothered testing gaming/numa mode yet)

got 4x 8GB g.skill flare X 3200MHz / CL14

[Dafadau]

JHR1979 wrote:
Sounds normal, Got just the trial version of AIDA, its giving mem read 75200 and latency 92,2. (in the default crative/uma mode, not bothered testing gaming/numa mode yet)

got 4x 8GB g.skill flare X 3200MHz / CL14

That reassures me a bit; but I've seen some benchmarks with mem read at around 92000 and latency around 60ns - I'm also getting quite low PC Mark 10 scores of 4807

NUMA gives:

Mem read: 84857
Mem write: 84489
Mem copy: 77753
latency:76.2

[JHR1979]

Dafadau wrote:
That reassures me a bit; but I've seen some benchmarks with mem read at around 92000 and latency around 60ns - I'm also getting quite low PC Mark 10 scores of 4807

NUMA gives:

Mem read: 84857
Mem write: 84489
Mem copy: 77753
latency:76.2

Perhaps on those benchmarks you've seen the system was heavily overclocked and memory settings tweaked to the max.


EDIT:

OC'd the cpu to 3,8GHz, swapped to NUMA mode and this is the result:
(just to show how it is possible to get higher results)

[Mikan02]

Dafadau wrote:
That reassures me a bit; but I've seen some benchmarks with mem read at around 92000 and latency around 60ns - I'm also getting quite low PC Mark 10 scores of 4807

NUMA gives:

Mem read: 84857
Mem write: 84489
Mem copy: 77753
latency:76.2

Looks ok I think.

Random run CPU @3.4 and my G.Skill 3200 kit at 14-14-14-34 and rest auto.
Read 90883
Write 90563
Copy 81612
Latency 66.8

I used the AIDA Cache & Memory benchmark to be quick, but it can be a bit off.
I think that is cause it is running all tests after each other. Only memory read
does not get affected so much since it is first.
Usually more accurate running one and one in the benchmark section (main window AIDA64).

[Mikan02]

Straight of copy of my reply to someone else about UMA/NUMA over at Nvidia forums that could not find the option on their MSI.

There are 2 ways swapping between NUMA and UMA.
I think it should be somewhere similar in the UEFI on your MSI.

--> Advanced \ AMD CBS \ DF Common Options
Then look for "Memory Interleaving"
Auto or DIE --> Distributed Memory Access Mode -- UMA (Uniform Memory Access) -- 1 CPU high latency
Channel --> Local Memory Access Mode -- NUMA (Non-Uniform Memory Access) -- 2 CPU low latency

You can also use "AMD Ryzen Master" to swap between the two modes in Windows but it requires a restart.
http://www.amd.com/en/technologies/ryzen-master


With Ryzen Master you can also set CPU to Creator mode or Game Mode.
Creator Mode syncs all cores to 3.4
(Good place to start for anything that require 100% load for an extended time and so on).

Game Mode turns off one CPU for compatibility, in short changes your CPU into a 1800X. ^^
Keep in mind this moves all heat to one side, so be careful with a cooler that does not have
full coverage of the IHS.

If latency in UMA is around 90ns to 100ns, then NUMA should give about 64ns to 74ns I guess.
Latency is also affected by your CPU speed/overclock. 🙂

I would only use Game Mode if there is any compatibility issues, but it is not required to run NUMA mode.

Experiment to find best result both modes are useful. 😉
Keep in mind latency might matter more on something like a online game.

[Korth]

Another man's settings or benchmarks mean nothing when anything is overclocked, lol.

Your memory kit has tested latencies of 15-17-17-35 (at DDR4-3000, PC4-24000, 1.35V).

Just curious, what values do you get from Intel Memory Latency Checker?

[Dafadau]

Korth wrote:
Another man's settings or benchmarks mean nothing when anything is overclocked, lol.

Your memory kit has tested latencies of 15-17-17-35 (at DDR4-3000, PC4-24000, 1.35V).

Just curious, what values do you get from Intel Memory Latency Checker?

Here you go: