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Asus Z790 Maximus Hero and 4 sticks of DDR5

FasUPy
Level 8

Hi to all,

So i've been on some overclocking dc servers and a forum, asking for infos, and that didn't sound very good.

I've got myself a Z790 maximus Hero (not the dark nor the BTF), and I also already have in my possession 4 sticks of 32g of ram (Vengeance CL32  6600 MT/s).

I've been told that there is no way this could go over 4800 stable or 5200 at the best, that I shouldn't xmp those four sticks. (things would be easier with two they say), is that a true thing ? 

As I already have got the ram and can not return it, I'd be kind of sad to have to sell half or all of it to go for other sticks (but 2)

Btw, with a i9 14900k

Thank in advance

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1 ACCEPTED SOLUTION

Accepted Solutions

Jiaszzz_ROG
Customer Service Agent

Hello, @FasUPy 

In addition to Silent_Scone's post, for information on memory overclocking settings and troubleshooting, please refer to [Motherboard] How to optimize Memory performance by setting XMP or DOCP in BIOS?
Also, ASUS has verified the motherboard for the best stability and compatibility when installed with the devices in the Memory QVL list.
Therefore, kindly consult the "purchasing and installation guide" in the Support page>CPU>Memory section of the official website for the ROG MAXIMUS Z790 HERO, as well as the installation slot recommendations in the user manual.

・Overclocking memory involves boosting memory frequency or tightening timings. It's essential to note overclocking memory may not always improve performance. Increasing memory frequency can boost read and write speeds while tightening timings can improve copy and latency performance. In gaming, low latency is often more important than high frequency.
・Running EXPO/D.O.C.P at DDR5 6400 or higher may not yield proportional memory performance gains due to current AMD processor architecture limitations.
・When installing a memory kit, please adhere to the DIMM slot priority cited in the Memory installation section of the product manual.
・Ensure that all memory modules are from the same validated memory kit. Do not mix DIMMs from different memory kits—even if they are the same brand and model (e.g., two DIMMs each from two different memory kits). Mixing and matching DIMMs can result in a failure to boot and compatibility issues. In particular, the stability of a system with mixed DIMMs cannot be guaranteed when XMP (Intel)/D.O.C.P (AMD)/EXPO (AMD)/AEMP/AEMPII is enabled. For example, enabling XMP (Intel)/D.O.C.P (AMD)/EXPO (AMD)/AEMP/AEMPII to speeds above DDR5 4800MHz or above DDR4 3200MHz could result in an unstable system.
・The stability and compatibility of memory kits operating beyond the POR standard, such as XMP (Intel), D.O.C.P (AMD), EXPO (AMD), AEMP, and AEMP II, are not guaranteed, as they can be affected by the CPU's memory controller, installed devices, and bus frequencies. For better compatibility, use DIMMs with the same CAS latency, and consider memory modules from the same vendor with matching version or date code. DDR5 speed may vary depending on the number of memory modules; generally, 2 DIMMs offer faster performance compared to 4 DIMMs, with actual speeds depending on your platform and configurations.
・The default DIMM frequency depends on its Serial Presence Detect (SPD), which is the standard way of accessing information from a memory module. Under the default state, some memory modules for overclocking may operate at a lower frequency than the vendor-marked value. To set the rated speed of the kit, please select XMP(Intel)/D.O.C.P(AMD)/EXPO(AMD)/AEMP/AEMPII or apply manual settings.
・When installing total memory of 4GB capacity or more, Windows 32-bit operation system may only recognize less than 3GB. Hence, a total installed memory of less than 3GB is recommended.

Thank you.

sharing complete hardware info & software config details will help us better understand the issue 🙂

View solution in original post

10 REPLIES 10

Silent_Scone
Super Moderator

Hi @FasUPy 

I would have a read here.
When you've done so, if there's anything you're unclear on let me know! The short answer is combining and mixing kits is not supported by the memory or motherboard vendor.

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

Hi @Silent_Scone , thanks for you answer and your article.

I went through it, pretty clear, well put together !

Altough, just a few questions : 

 

  • what is sku ?
  • does xmp 2 then means "stock" settings, or is it between stock and xmp, or is
    it an actual overclocking ? (so either stock, slight oc, or oc ?)
  • On main DDR5 ram sticks, does XMP Tweaked requires additional configuration (manually?)

 

Appart from that, I bought in 2 (qty) a set of 2x32 gigs of corsair, is that considered as combining kits ? It's the exact same though.
Also, I then went onto the Z790 hero's QVL, looked for tests at 2 x 48 gigs, no results, does that mean it's a bad idea to do so ? (I'd like to go for this option now so...)

What so ever, do you know a simple (or detailed) ram OC guide, for tweaking a little more than XMP does ? Just to be able to manual fine tune my ram in case XMP outputs an unstable configuration for the kit I will have in the end.

Thanks for your help

 

Hi! 

1. Make sure both modules are in slots A2 and B2.

2. Update UEFI to 2102.

3. Try XMP II.

Contrary to assumptions, XMP/EXPO doesn't ensure automatic overclocking. Tighter timings or higher frequencies may require manual adjustments for stability. Overclocking cannot be assured due to variance between parts when run outside manufacture specifications. XMP/EXPO success also greatly depends on the processor's Integrated Memory Controller (IMC) capabilities.


XMP/EXPO I This is the validated board profile. Every time a board is validated with a particular memory kit, the memory vendor and ASUS use this profile to validate the kit for the QVL.

XMP/EXPO II - This is the default DIMM profile from the memory vendor and contains sub-timings stored within the SPD EEPROM of the memory module.

XMP/EXPO Tweaked - This is the fastest profile and contains various tuned sub-timings and memory parameters.

For better success in achieving "plug and play" overclocking, consider memory kits that are one to three frequency bins below the motherboard's maximum qualification on the QVL. The higher the frequency and tighter the timings, the more likely manual tuning might be needed to adjust for signal variance between parts—success with memory kits at or near the top of the QVL validation table depends largely on the quality of the CPU memory controller.

All the info you've asked additionally is in the aforementioned article. Combining any kits, regardless of part number is not supported

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

dennys2009
Level 9

Hi!
First, you will collect everything, install memory, and then you will solve the problem if it arises. Start by installing two memory modules in slots A2 and B2. Start the system, enter the Bios, update the Bios to the latest version, then select the XMP1 profile, press F10 and see what and how. If the start is successful, we load into Windows. If everything works as it should, turn off the computer, de-energize and install the remaining memory modules. Checking the system load.

Hey @dennys2009 ,

thanks for your message.

Well I like that idea, and I was planning to do something like this first, but I'll do exactly what you said in first place. If I'm not wrong the xmp1 sets as stock, knowing DDR5 is at 4800mts stock it means that the ram will run at 4800 right ? 
Three questions :

How can I de energize the computer (any tip for that apart pressing the start button 10 times ?)

What software (and its configuration ?) do you think I should use to make some stress testing

Do you think that if it works in the end, it would be possible trying to XMP II ?

In advance, thanks

Hi!
"How can I de energize the computer" - disconnect the power cord from the computer power supply and wait a little 10-15 seconds.
"What software..." - you will first boot to at least Windows with the specified memory settings on the package.
"XMP II" - If nothing helps to start the computer on XMP I, then go to XMP II mode and try on it.

Jiaszzz_ROG
Customer Service Agent

Hello, @FasUPy 

In addition to Silent_Scone's post, for information on memory overclocking settings and troubleshooting, please refer to [Motherboard] How to optimize Memory performance by setting XMP or DOCP in BIOS?
Also, ASUS has verified the motherboard for the best stability and compatibility when installed with the devices in the Memory QVL list.
Therefore, kindly consult the "purchasing and installation guide" in the Support page>CPU>Memory section of the official website for the ROG MAXIMUS Z790 HERO, as well as the installation slot recommendations in the user manual.

・Overclocking memory involves boosting memory frequency or tightening timings. It's essential to note overclocking memory may not always improve performance. Increasing memory frequency can boost read and write speeds while tightening timings can improve copy and latency performance. In gaming, low latency is often more important than high frequency.
・Running EXPO/D.O.C.P at DDR5 6400 or higher may not yield proportional memory performance gains due to current AMD processor architecture limitations.
・When installing a memory kit, please adhere to the DIMM slot priority cited in the Memory installation section of the product manual.
・Ensure that all memory modules are from the same validated memory kit. Do not mix DIMMs from different memory kits—even if they are the same brand and model (e.g., two DIMMs each from two different memory kits). Mixing and matching DIMMs can result in a failure to boot and compatibility issues. In particular, the stability of a system with mixed DIMMs cannot be guaranteed when XMP (Intel)/D.O.C.P (AMD)/EXPO (AMD)/AEMP/AEMPII is enabled. For example, enabling XMP (Intel)/D.O.C.P (AMD)/EXPO (AMD)/AEMP/AEMPII to speeds above DDR5 4800MHz or above DDR4 3200MHz could result in an unstable system.
・The stability and compatibility of memory kits operating beyond the POR standard, such as XMP (Intel), D.O.C.P (AMD), EXPO (AMD), AEMP, and AEMP II, are not guaranteed, as they can be affected by the CPU's memory controller, installed devices, and bus frequencies. For better compatibility, use DIMMs with the same CAS latency, and consider memory modules from the same vendor with matching version or date code. DDR5 speed may vary depending on the number of memory modules; generally, 2 DIMMs offer faster performance compared to 4 DIMMs, with actual speeds depending on your platform and configurations.
・The default DIMM frequency depends on its Serial Presence Detect (SPD), which is the standard way of accessing information from a memory module. Under the default state, some memory modules for overclocking may operate at a lower frequency than the vendor-marked value. To set the rated speed of the kit, please select XMP(Intel)/D.O.C.P(AMD)/EXPO(AMD)/AEMP/AEMPII or apply manual settings.
・When installing total memory of 4GB capacity or more, Windows 32-bit operation system may only recognize less than 3GB. Hence, a total installed memory of less than 3GB is recommended.

Thank you.

sharing complete hardware info & software config details will help us better understand the issue 🙂

Hey Jiaszzz,

Thanks for the informations, I did check the QVL yesterday, to be honest I thought that it wouldn't be hard for 128gb of ram to be run at its announced speed on the motherboard, as the motherboard is announced with a capacity of 196gb of ram.

Now it makes more sense, and never try never know as they say, but especially for dual rank sticks, the IMC even though the motherboard will be coupled with a 149k, will be rough on that much memory and that high frequencies.

As the last time I built a PC with the help of someone was over 8 years ago, things changed a lot. Seems like Moore's Law is running low on fuel.

Thanks to all for your answers, I will apply first the procedure of @dennys2009 , stress the memory for some time, then see how it goes.
I mark the last rep to this post as the solution but all of the messages were helpful, thanks again.