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Asus z790-e gaming WiFi G.Skill S5 192GB compatibility issues

vtarca
Level 8

Hello, I have 2 kits of 96GB G.Skill RAM (F5-5200J4040A48GX2-RS5K) that I am trying to use with my asus rog strix z790-e gaming WiFi motherboard. When I use just one kit everything works fine, but I am trying to use both kits, which should be fine since they are the exact same type of ram ordered at the same time. Is there any settings I could modify in BIOS to get the kits to work together? When I use both kits the computer only boots every other time. Thank you so much for your help.

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5 REPLIES 5

Silent_Scone
Super Moderator

Hi @vtarca 

Please see article below. Memory vendors bin memory kits according to the density at which they are sold. If you combine them with more memory (regardless of what that memory is) the guardband the vendor has put in place to ensure the best chance of compatibility is no longer valid. If enabling XMP overclocking, ensure that only one kit is used. Beyond this, manually overclocking will be required to find stability.

https://rog-forum.asus.com/t5/technologies-explained/memory-kits-overclocking-and-what-you-may-not-k...

13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090

Hello @Silent_Scone , thank you so much for your reply. 

In your post you mentioned something about manual overclocking, and while I understand it isn’t recommended to mix the memory kit due to the bins, is there some guide on manually adjusting it or some general tips you could give me on this? Thank you

Without trying to be dismissive, no, not really. When you combine kits, you're potentially back to square one depending on how much guardband the vendor instills when binning. That's why you pay for binning in the first place. The easiest route initially is to lower the DRAM frequency to see at which point the system can POST, then look towards both voltage and timings.

Use XMP II, as the default DIMM profile often has relaxed subtimings compared with the ASUS Optimised profile (XMP I).

13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090

Hello, I have enabled XMP II and then have started off with  lower frequency which seemed to have worked, and now I am testing other settings. Is there a guide or something you could provide me which would explain to me the theory behind the voltage/frequency changes and when to use them? Thank you for your advice

tom5333
Level 7

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