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3700X Dual Channel with Single & Dual rank memory

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post #1 of 2 (permalink) Old 12-19-2019, 12:45 PM - Thread Starter
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3700X Dual Channel with Single & Dual rank memory

I would like to ask anyone who has information about combining memory, whether it is a good idea to mix 2 single rank memory and 2 dual rank memory with Zen 2. I have found out on one site that it shouldn't be a problem, as long as they have same chips, frequency, primary, secondary timings, electric layout, etc. Somehow I am sceptical about it.

I know X470 Taichi has T-topology, which should mostly rectify disadvantage of using 4 ram modules, compare to Daisy chan topology, which is ideal for 2 ram modules (in dual channel systems). So I thought it might suprise me, and work very well, even though not usually implemented. Anyway I want to ask before I would waste a lot of time for something what (probably) isn't going to work.

AMD 3700X
Asrock X470 Taichi
16GB 3800MHz 1:1:1 CL15-16-16-16 (Fast Preset in DRAM Calculator)

RAM modules I'm talking about:

First (Current) set of RAM: G.Skill F4-3200C14D-16GTZ
Second set that I ordered: G.Skill F4-3200C14D-32GTZ

Q: Can I mix different size of single and dual rank in 3700X, when I want to OC memory and CPU? Should I put 2 8GB rams in 1 channel and 16GB rams in other channel, or how should I combine them? Do they need different voltage for optimal perfomance? What perfomance penalty should I expect?

I planned to change 16 GB Single Rank for 32 GB Dual Rank, and repurpose 16 GB set in other build that I plan. But then I realized other build won't be build at least for half a year, so I wondered if I could use them together with second set that I ordered.

Thanks for any info.

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post #2 of 2 (permalink) Old 12-26-2019, 01:57 PM
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Use the 16GB modules in slot 2 and 4 away from CPU, then 1 and 3 for 8GB.

You will need to test and see what they can do together. Only you can find out as you have the modules in hand. Let us know how it goes

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3700x , g.skill , Ram Oc , zen2

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