Contemplating 128 GB on X370

Hardware Hub
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So my server is on a consumer platform. I took a look at its QVL and its specs. It does seem to support some kits of 4x32 GB RAM kits

The motherboard is an ROG Strix X370F-gaming motherboard from ASUS and it currently has a 3900X processor in it

I took a look at what has been reliable RAM for me im the 32 and 64 GB configurations before. Now this is the 128 GB kit

G.Skill Trident Z RGB Series 128GB (4 x 32GB) 288-Pin SDRAM (PC4-25600) DDR4 3200 CL16-18-18-38 1.35V Quad Channel Desktop Memory Model F4-3200C16Q-128GTZR

Would it work? There doesnt seem to be a reason why it wouldnt. The most fickle thing would be the IMC which really is what determines your limitations here and seeing as its an ROG they have always been known to perform above and beyond advertised specification

Here is a link to the support page for the motherboard. Im tempted to say it will as it is samsung B die

Opinions, experiences, tips are all welcome

What isnt an option:

Upgrading any other part except the RAM.

The amazon prime day shopping discounts are coming and usually RAM trends even cheaper according to multiple history reports around this time.

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I could be wrong, but I believe both the motherboard and CPU must support 128GB, which pre-x570 boards do not, and pre-3000 series ryzen does not.
At the very least, the manual for your motherboard lists 64GB max supported, so I would check in with Asus to make sure 128GB will work with your board.

Though, posts on reddit suggest it works just fine, at least on some X470 boards.

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That is what made me wonder the same thing lol. Also I am not pre 3000 series either. The board supports the 3xxx series amazingly well. No issues at all. Unlocked a ton of performance and uefi options too. Anybody got a POC at ASUS? Generic support takes forever

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Actually, I’m even finding posts of 128GB working on 2000 series CPUs as well…
I wonder if it’s just soft support/validation? IE, they can deny support or warranty for higher memory configs.

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Its possibly along the lines of the latter statement. I run a Ryzen 9 3900X its more than capable of dealing with it. The nice thing also is that if it doesnt work I can just return it to amazon

Amazon >> newegg. Returns are so easy and paid for

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Im still open to other peoples replies. Looking for a sample size > 5-10 if I can

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I believe 128GB support is unofficial on older chipsets - I have a Strix X470-F sitting in a server right now that has 128GB of ECC installed (as confirmed by htop), but the specs page only lists 64GB as supported, so it’s definitely possible even if not officially supported. I am using a 5700X on there though.

Google reckons the 3900X supports 128GB, and Ryzen memory controllers are on the CPU if I remember correctly, so I’m leaning towards it’ll probably work.

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Thats a good sign. I really want to do it. I could enable dedup and save 2.1 TB of space on my 24 TB ZFS array

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Maybe. As you pointed out, 4 DIMMs config is dependant on how much luck you have with your CPU memory controller and board topology. You should still be able to return those kits to Amazon if it doesn’t work, so not much risk trying…

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I suspect its just a case of not being QVL’d.

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you running ecc ram? Also I have 128gb non ecc in mine and it is working fine.

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No. I dont have a need for ECC and ECC is kind of not worth its price unless your going registered and buffered

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Its not that much more expensive

$88 per 32gb ECC 3200

I have been telling myself 94gb it not as good is plenty fine

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Yeah but in comparison? Think about this for a sec. I can get 128 GB non ECC for ~250 dollars

ECC 4x32 GB stick is ~352 that’s not insignificant.

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Almost all AM4 boards will accept ECC UDIMMs. But most of them don’t have the necessary electrical wiring. So it’ll be kinda pointless if you spend the extra money and can’t make use of the ECC functionality.

All 32GB UDIMMs are dual ranks. Four sticks will be four ranks per channel. Max reachable speed may not be as high as before. In reality perhaps still fine at 3600 MT/s. Just in case you overclock. Personally, it’s too tempting to squeeze a bit extra performance for free. Interactive VMs seems more responsive in case you happen to run them on the server.

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@mutation666 this was something I forgot to mention they advertise it but don’t wire it up correctly

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Possible on your board for sure

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On the handful of builzoid videos i have watched, I noticed that he usually comments the weirdness of how ASRock always have overbuilt circuit traces for its RAM, I suspect because only ASRock builds proper ECC mobo support for consumer Ryzen.

Generally ASUS mobos are relatively overbuilt for a long as you are not on its budget line.

Also 128GB should work on your system but dont quote on that or ask me for refunds of your unsupported RAM.

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We will find out tomorrow :laughing:

Got 128 GB of RAM for $199

Soooo cheap

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Seems like DIMM pricing scales pretty much the same across the world. That’s about double the price of my two 32GB sticks I bought less than a month ago.

I think now is the sweet moment to buy DDR4. Price has been dropping for the last few quarters. It’s forecasted to slow down hugely next quarter. So I believe we’ll see price bottom out soon. When supply dries up, price is going to climb up as little again before disappearing from the first hand market.

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