Recommend a two (2x32gb) - Trying to get 128gb in DDR5 on 13th gen intel / asrock Taichi z790

Coming from the youtube video, but didn’t want to hijack it for an intel quesiton - the XMP database from Intel seemed to list GSkill a lot on the 13900k (though they don’t have anything listed for 4 dimms) - so I took a gamble and ordered two of the following -

I got two of the Gskill Ripjaws 32gb x 2 @ 5200 with CL of 36. (G-Skill-RipJaws-288-Pin-CL36-36-36-83-F5-5200J3636D32GA2-RS5K)

I’ve made peace with the fact that the speed won’t be there. At least it shouldn’t be slower than my current rig running DDR4 at 4000. The main thing is I will have 128 gb in the system stable.

In case the kit I ordered doesn’t work, would anyone be willing to share their kits and what settings worked for them?

https://www.asrock.com/mb/Intel/Z790%20Taichi/index.asp#MemoryRPL

This list contains exactly 3 entries that allow 128GB configurations. All of these at 4800MT.
Any other recommendation should have first hand experience or I’d stay away from it. 4x DDR5 configurations have not yet proven to be as stable/reliable/performant as similar DDR4 configs.

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I had already seen this but it was my 1st time reading through a QVL - what am I missing? I couldn’t find the 3 entries you spoke of?

I was looking for lines that show a “DIMM Socket Support” of “2/4” indicating that they certified a configuration containing up to 4 DIMMs (one in each socket) and “Size” of “32GB”.
To avoid looking through all entries I sorted by “Size” by clicking on the column name.

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FYI, the timings affect the “speed” more than raw frequency. The CL rating is how many fequency cycles it takes for the action to complete, with a higher CL rating having more latency than a lower one.

DDR4 3200-C16/3600-C18 are both 10ns

DDR5 5600-C28/6000-C30 are also both 10ns

Your 5200-C36 kit has a latency of 13.8ns, which means your DDR4-4000 kit would need a CAS latency of 28 or higher to actually be “slower” than the new DDR5 one.

Also memory ranks are equally important, whether too many or too few.

What kit would you recommend?

I don’t have enough experience with ddr5 to be able to give you a recommendation, sorry. Whatever it is though you’ll probably have to down-clock to get two 2x32 kits to run.

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According to the reddit post below you should be able to reach close to 5000MHz with that setup, but there doesn’t seem to be many people who tried that out, so do report back how it went for you after you get it :slight_smile:

Case won’t get here for another week - going to take me awhile to build b/c I don’t build every few years and it’s my first time doing a custom loop. Everything changes in PC building it seems in 3-5 year cycles, but this time it seems like even more change. Still, I’ll report back what speeds I get.

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