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nounours18200
Joined: 29 Apr 2021
Posts: 1
Location: France
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 Posted: Thu Apr 29, 2021 4:15 pm Post subject: AMD Ryzen V1500B: max RAM "strange" question |
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Hi,
Like thousands of users, I have a Synology NAS model DS1821+, equipped with the abovementionned AMD Ryzen processor.
The manufacturer (Synology) says that the maximum RAM supported is 32Gb and recommend to not install more than 32Gb in the NAS.
The specifications that I have found around (but not on the AMD website) give max RAM = 32Gb
But a lot of websites such as (nas-compare.com for example) and a lot of users have installed 64Gb (3x32Gb) in the NAS, and the system reports "RAM installed = 64Gb", and the Synology works like a charm.
So what ??
Could it be possible that the "testers" are all wrong and: 64Gb is the capacity reported by the Bios whereas the processor uses ONLY 32gb ???
Thank you for your expertise ! |
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Wasmachineman_NL
Joined: 04 Jul 2019
Posts: 988
Location: Netherlands
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| Posted: Thu Apr 29, 2021 6:06 pm Post subject: |
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| Ryzen supports 32GB DIMMs so 64GB RAM is correct. Theoretically you could go up to 128GB with Ryzen. |
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Guest
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| Posted: Fri Apr 30, 2021 9:17 am Post subject: |
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Thanks: this is also confirmed on the Synoforum thread: ds1821-max-ram.5866/
The remaining issue is the attitude of Synology regarding the warranty: if we install more than 32Gb, this will be written somewhere in the log file, so Synology could refuse to undertake the warranty if a problem occurs.
I still do not understand why Synology indicates this 32Gb limitation if the Ryzen can manage 64Gb or even 128Gb ???? |
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CPUShack
Joined: 16 Jun 2003
Posts: 34259
Location: State of Jefferson, USA
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| Posted: Fri Apr 30, 2021 11:24 am Post subject: |
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More RAM requires more power draw. They may have designed the power supply/board regulators to handle 32GB but didn't really test them at above that.
Could also increase thermal loads that they didnt design for.
Keep it cool and it should be happy
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debs3759
Joined: 18 Jan 2006
Posts: 9477
Location: Northampton, Divided Kingdom
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| Posted: Fri Apr 30, 2021 11:26 am Post subject: |
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Might be a silly question, but why would a NAS need that much RAM? If it's only being used as a file server, surely the requirements should be quite low?
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cvandijk
Joined: 21 Jul 2016
Posts: 3589
Location: Netherlands
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| Posted: Fri Apr 30, 2021 11:35 am Post subject: |
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| You can run docker containers and other stuff on it, it's just like a real server. So if you have more memory you can do more with it. |
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Guest
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| Posted: Fri Apr 30, 2021 12:24 pm Post subject: |
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| Quote: | | You can run docker containers and other stuff on it, it's just like a real server. So if you have more memory you can do more with it. |
Exactly !
This is why we need more than the default 4Go...
| Quote: | | They may have designed the power supply/board regulators to handle 32GB but didn't really test them at above that. |
Compared with the disks power consumption, the memory modules is certainly a very small percentage of that, so I doubt this could be a valid reason...
| Quote: | | Could also increase thermal loads that they didnt design for. |
same remark than above
| Quote: | | Keep it cool and it should be happy |
100% agree ! it will be located in a room where there is no heat in winter, and I can turn the air conditioning up in summer: so heat should not be a problem!
I believe that I will go for 32Gb not 64Gb, because I do not plan a so intensive usage: maybe 1 VM (to play with Linux) but nothing that can justify 64Gb.
by the way, is it possible to have 20Gb: the original 4Gb module + a 16Gb module ? |
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Wasmachineman_NL
Joined: 04 Jul 2019
Posts: 988
Location: Netherlands
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| Posted: Fri Apr 30, 2021 12:33 pm Post subject: |
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| Anonymous wrote: |
by the way, is it possible to have 20Gb: the original 4Gb module + a 16Gb module ? |
Don't do that. Never mix modules as they ruin performance. |
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Calbris
Joined: 06 Feb 2019
Posts: 157
Location: Singapore
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| Posted: Fri Apr 30, 2021 1:01 pm Post subject: RE: AMD Ryzen V1500B: max RAM "strange" question |
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| Wasmachineman_NL wrote: | | Don't do that. Never mix modules as they ruin performance. |
I second this.
Yes. It will work, but the memory bandwidth would be halved as soon as you go over 4 GB in RAM usage. Not the best idea in my book. |
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Guest
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| Posted: Fri Apr 30, 2021 1:47 pm Post subject: |
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OK good: 2x16Gb will be the way to follow ! it will be enough to play with a VM...
Thank you very much |
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mavroxur
Joined: 06 Jul 2005
Posts: 1192
Location: Wichita Falls, TX
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| Posted: Fri Apr 30, 2021 7:46 pm Post subject: |
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| debs3759 wrote: | | Might be a silly question, but why would a NAS need that much RAM? If it's only being used as a file server, surely the requirements should be quite low? |
lots if NAS appliances can run background apps and plugins |
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