UNSOLVED
Aurora R12, disappointing memory performance
Received my R12 a week or so ago, and have been playing around with settings to optimise performance.
I am very surprised and disappointed to see that the memory performance at RAM2 (1600 MHz) setting is 13.5% less that at RAM1 (1467 MHz) setting. Even the Disabled (1333 MHz) setting is faster than RAM2.
Is this an issue with the motherboard, or the V1.0.3 BIOS?
| Setting | Clock MHz | Memtest MB/s | 3D Mark TS CPU |
| RAM2 | 1600 | 22351 | 10208 |
| Disabled | 1333 | 24247 | 11484 |
| RAM1 | 1467 | 25359 | 11709 |
Memory is 2x Kingston/Micron Module Part Number: XVTW4H-MIE
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Posted April 27th, 2021 13:00
If you have a chance, could you download a small free program called CPU-Z, and post the information from the SPD tab and the memory tab?
The SPD tab will show the timings of the memory profiles and frequency.
They will in turn determine the latency, and the latency will affect the memory read/write speeds.
4847
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Posted April 27th, 2021 17:00
So I found this interesting video that describes the issue with Intel 11700K (which I have) when using 3200 MT/s memory or faster. It has to do with cutting the memory controller clock rate in half (called gear 2) for these faster memory chips.
https://www.youtube.com/watch?v=AgFlB0HG_84
Unfortunately this doesn't fully explain my situation. HWiNFO64 and CPU-Z shows that the memory controller runs in gear 2 for all 3 memory clock speed settings.
4811
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Posted April 27th, 2021 18:00
Someone else pointed this out a while ago, and it looks like a bios configuration issue:
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Posted April 28th, 2021 09:00
Thanks for pointing me to that post. It did not (and still does not) show up in a search.
All the reviews I've seen paired the 11700/11900 with a Z590, while Dell/AW decided to carry over the Z490. I wonder how that plays into things?
Perhaps I should've just sprung for the 11900KF...
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Posted May 5th, 2021 14:00
I have 11900KF, and I have the same problem. Severe performance bottleneck at 3200
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Posted May 5th, 2021 14:00
Also have an R12 with the 11900KF and am getting terrible performance.
Has anyone tried an older BIOS (I am also on 1.0.3)
4631
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Posted May 5th, 2021 14:00
Can confirm my memory speeds are subpar as well on my R12 with 3400mhz memory, I hope they fix it as I'd hate to have to return it .
Has Dell acknowledged this memory issue? it seems widespread and many R12 users have complained about this
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Posted May 5th, 2021 15:00
For example: Systems using 3200MHz memory.
4266 1.35v Memory doesn't mean you can demand that dell make that work
its basically marketing. Its not 5 to 10 times faster more like 1 to 5 percent faster.
The Mhz myth is alive and well.
Intel Core i3/i5 processors, it is limited to 2666MHz.
Intel Core i7/i9 processors, it is limited to 2933MHz.
You wont find CAS 16 1.2v 3200 Mhz memory.
19 19 19 43 61 1333 Mhz JEDEC 1.20v
20 19 19 43 61 1333 Mhz JEDEC 1.20v
20 19 19 47 66 1468 Mhz XMP 2936 1.25v
20 20 20 52 72 1600 Mhz XMP 3200 1.25vhttps://www.youtube.com/watch?v=D_Yt4vSZKVk
crimsom
9 Technologist
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6114 Posts
4928
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Posted April 27th, 2021 09:00
Hi @j_in_mn welcome to this user to user discussion forum. This is not Dell Support.
We assume that all the Windows Update and Dell Product Support for Aurora R12 drivers have been installed. If not, please update the Desktop Aurora R12 drivers.
RAM bus (data highway) transfer rates depend on the ability of the CPU interface with the system board to process this data. Please visit the CPU Specification to find its capabilities.
Kingston will recommend what RAM should be installed in your Aurora R12. Hopefully the RAM purchase is one of these Kingston recommendations.
PassMark has determined the Kingston XVTW4H-MIE capabilities.
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