Comparison between two RAM

Math Tec
Math Tec used Ask the Experts™
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Hi,

I need to know the difference between
-  HPE 128GB (1x128GB) Octal Rank x4 DDR4-2933 CAS-24-21-21 Load Reduced 3DS Smart Memory Kit
And
- HPE 128GB (1x128GB) Octal Rank x4 DDR4-2666 CAS-22-19-19 3DS Load Reduced Memory Kit

I mean which one has better performance

Thanks
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AlexSenior Infrastructure Analyst

Commented:
The timings and frequency is different.

High frequencies have lower timings

Lower frequencies have tighter timings

Not really what else to point out here, what do you mean "the Estimated "Quota""?
Nathan HawkinsTechnical Lead - Network Security

Commented:
HPE 128GB (1x128GB) Octal Rank x4 DDR4-2933 CAS-24-21-21 Load Reduced 3DS Smart Memory Kit
https://www.hpe.com/no/en/product-catalog/servers/server-memory/pip.hpe-ddr4-smartmemory.1010999587.html

HPE 128GB (1x128GB) Octal Rank x4 DDR4-2666 CAS-22-19-19 3DS Load Reduced Memory Kit
https://www.hpe.com/ca/en/product-catalog/servers/server-memory/pip.hpe-128gb-1x128gb-octal-rank-x4-ddr4-2666-cas-22-19-19-3ds-load-reduced-smart-memory-kit.1009449824.html

They look very similar but the specs show that the HPE 128GB (1x128GB) Octal Rank x4 DDR4-2933 CAS-24-21-21 Load Reduced 3DS Smart Memory Kit is DIMM native speed (MT/s) = 2933 MT/s

and the HPE 128GB (1x128GB) Octal Rank x4 DDR4-2666 CAS-22-19-19 3DS Load Reduced Memory Kit is DIMM native speed (MT/s) = 2666 MT/s

So HPE 128GB (1x128GB) Octal Rank x4 DDR4-2933 CAS-24-21-21 Load Reduced 3DS Smart Memory Kit is a smidge faster.
Top Expert 2014

Commented:
$2,175.95 Vs $ 1,498 per stick.

Bear in mind it is far cheaper to use more smaller DIMMs, that LRDIMMs are more expensive than RDIMMs, that for over 1TB per CPU "M" or "L" series CPUs are required and that RAM gets cheaper over time so holding off until you need it. HPE also overclock their smart memory if you set it in CMOS.

Speed table here - https://h20195.www2.hpe.com/v2/Getdocument.aspx?docname=a00019564ENW
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Top Expert 2014

Commented:
Scratch that price comparison, the P00928-B21 wasn't genuine HPE so can't be overclocked in a ProLiant.

Author

Commented:
Hi,

So, HPE 128GB (1x128GB) Octal Rank x4 DDR4-2933 CAS-24-21-21 Load Reduced 3DS Smart Memory Kit is better performance than HPE 128GB (1x128GB) Octal Rank x4 DDR4-2666 CAS-22-19-19 3DS Load Reduced Memory Kit.

It will be used in server that has duel CPU type HPE DL380 Gen10 Intel Xeon-Platinum 8180M (2.5GHz/28-core/205W)

Thanks
Top Expert 2014

Commented:
Platinum 8180M Maximum Memory Speed is 2666 MHz so the faster RAM won't be faster with those CPUs AFAIK.
Technical Architect - HA/Compute/Storage
Commented:
2933MT/S with 24-21-21 timing.
2666MT/S with 22-19-19 timing.

The difference in performance given the slightly slower timing (the three sets of numbers) means that performance gains with the higher clock speed will be minimal.

The catch will be as to whether the CPU supports the 2933MT/S speed in the first place. If it doesn't, then the DIMMs would back-speed themselves to the speed the CPU could support ... if they are compatible that is.
Top Expert 2014

Commented:
I already pointed out that their chosen CPU does not support 2933MT/S. They will probably clock down but without running CPU-Z to get the timings for the lower clock speed we can't tell which would be faster. HPE only list the top spec but there will be other specs in the SPD info.

One more difference, the 2933MT/S ones are only available in sample quantities at the moment. For example:-

https://www.samsung.com/semiconductor/dram/module/M386AAK40B40-CWD/
https://www.samsung.com/semiconductor/dram/module/M386AAG40MMB-CVF/

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