2020/03/24 19:32:26
ZoranC
I’ve been trying to benchmark memory on my new build that I am hoping somebody will help me with.
I have EVGA X299 Dark with i9-10900X and I am trying to populate 4 memory slots with Corsair 3000 MHz CL15 32GB DIMMs (https://www.corsair.com/u.../p/CMK64GX4M2C3000C15) in each for a total of 128GB. I am using Corsair’s XMP Profile and memory is stable, passing all memory tests I have thrown at it.
 
When I run PassMark PerformanceTest with just one slot populated I get Read Uncached 13965 and 8192 Write. With two slots populated I get Read Uncached 15248 and Write 13143. With three I get Read Uncached 15311 and Write 13748. With four I get Read Uncached 10153 and Write 15347.
 
In other words going from single to dual gave me ~ +9% reads and +60% writes. Going from dual to triple gave me practically -no- difference.
 
And going to quad resulted in ~ 12% improvement of writes over triple (+87% over single) _BUT_ HUGE DROP in reads, not just when compared to triple and double but even when compared to single. According to PassMark my quad channel reads are ~ 33% slower over single channel ones!
 
I’ve checked am I having stick that is performing worse than others and all of them when put in same slot benchmark practically identically.
 
I’ve checked am I having a slot that is performing worse than others and same stick when put in different slots benchmarks practically identically across all of them.
 
So what is going on with my reads?! I would appreciate help, please, in figuring it out.
 
I would also appreciate pointers in direction of other memory benchmarks so I can rule out PassMark as possible culprit. Hopefully something that is very detailed, thorough, configurable and with result that can be compared to real world specs rather than just single figure that has no common unit of measure.
2020/03/25 10:39:28
Sajin
Try the aida64 memory benchmark.
2020/03/25 10:48:16
ZoranC
Sajin
Try the aida64 memory benchmark.



Thank you, I have already tried Aida64 and unfortunately it seems to use cached reads lumping everything into single figure.
2020/03/25 11:15:11
Sajin
Only other one I know would be maxxmem2.
2020/03/25 11:57:06
Sajin
Oh, and I almost forgot about winsat... https://www.ghacks.net/2017/10/16/the-windows-winsat-command/
2020/03/25 12:18:27
ZoranC
Sajin
Only other one I know would be maxxmem2.



Thank you! Already tried that one too and it too seems to use cached figures aggregated into single value :(
2020/03/25 12:20:38
ZoranC
Sajin
Oh, and I almost forgot about winsat... https://www.ghacks.net/2017/10/16/the-windows-winsat-command/



Thank you! While it might not give me exactly what I am looking for memory wise it seems to be a thing I should add to my "toolbox".
2020/03/25 13:31:48
chinobino.
Can you post some screenshots of your memory timings using ASRock Timing Configurator in single, dual and quad channel?
 
It sounds like there is incorrect auto configuration when more DIMMs are added, which could be from poor RAM training or maybe BIOS is not well 'tuned' for 32GB DIMMs.
 
Also, if you have some 8GB or 16GB DIMMs, maybe take some screenshots with those installed for comparison and post them here too.
2020/03/25 13:45:02
ZoranC
chinobino.
Can you post some screenshots of your memory timings using ASRock Timing Configurator in single, dual and quad channel?

 
Thank you! I will do that as soon as I can.
 
chinobino.
 It sounds like there is incorrect auto configuration when more DIMMs are added, which could be from poor RAM training or maybe BIOS is not well 'tuned' for 32GB DIMMs.

 
That's exactly what I was thinking about last night, that XMP timings once I pass two could be resulting in it.
 
chinobino.
Also, if you have some 8GB or 16GB DIMMs, maybe take some screenshots with those installed for comparison and post them here too.

 
Unfortunately I don't have any 8GB or 16GB DIMMs. If I was to purchase some which ones you would be recommending?
2020/03/25 13:51:13
chinobino.
It would be ideal to compare a 16GB x 4 DDR4-3000 CL15 kit with what you have but I don't expect you to buy it just for troubleshooting.
 
I was just thinking of ways to see the change in performance with different capacity DIMMs and thought you may have had access to another RAM kit.

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