Question Asus Prime x670-E-Pro Wifi Boot failure on Cold Boot

[Stillent]

Hello Everyone,

I recently upgraded my Bios to version 3042 to patch out the AMD vulnerability, and proceed to use the system, except on cold boot the system would fail to post and I would see only the option to go onto bios and then start the system from there.

Looking around, I upgraded the BIOS to 3057 but the issue still remains.

The system doesn't seem to be behaving unusually outside of that situation. I don't overclock and the only change I made was enable my XMP in the BIOS after updating my Bios.

My Specs are:

Motherboard: Asus Prime x670-E-Pro Wifi
Cpu: AMD Ryzen 7 7800 x3d
Ram: G.SKILL TZ5E Neo RGB 6000 16Gx2 3038
GPU: Asus Tuff Rtx 4080 OC
PSU:Seasonic 1000w Vertex pcie5 PSU
Storage: Samsung Evo Ssd's

Any suggestion is appreciated.

Thanks

 

[Lutfij]

Welcome to the forums, newcomer!

https://www.asus.com/motherboards-c...helpdesk_bios?model2Name=PRIME-X670E-PRO-WIFI
Did you clear the CMOS after you'd verified that the BIOS was successfully flashed to the latest version? You're advised to disconnect from the wall and display, remove the CMOS battery, press and hold down the power button for 30secs to drain any residual power. Replace the CMOS battery after 30mins.

 

[Bob.B]

Hello Everyone,

I recently upgraded my Bios to version 3042 to patch out the AMD vulnerability, and proceed to use the system, except on cold boot the system would fail to post and I would see only the option to go onto bios and then start the system from there.

Looking around, I upgraded the BIOS to 3057 but the issue still remains.

The system doesn't seem to be behaving unusually outside of that situation. I don't overclock and the only change I made was enable my XMP in the BIOS after updating my Bios.

My Specs are:

Motherboard: Asus Prime x670-E-Pro Wifi
Cpu: AMD Ryzen 7 7800 x3d
Ram: G.SKILL TZ5E Neo RGB 6000 16Gx2 3038
GPU: Asus Tuff Rtx 4080 OC
PSU:Seasonic 1000w Vertex pcie5 PSU
Storage: Samsung Evo Ssd's

Any suggestion is appreciated.

Thanks

Do you have an expo ram option in the bios?

 

[Stillent]

Welcome to the forums, newcomer!

https://www.asus.com/motherboards-c...helpdesk_bios?model2Name=PRIME-X670E-PRO-WIFI
Did you clear the CMOS after you'd verified that the BIOS was successfully flashed to the latest version? You're advised to disconnect from the wall and display, remove the CMOS battery, press and hold down the power button for 30secs to drain any residual power. Replace the CMOS battery after 30mins.

Hi Lutfji,

No I did not clear my CMOS. It seems like the battery is in a convenient plate to remove, but I see there is a clear cmos button on the MB, I assume it does the same thing no?

Regarding the settings what do I loose? Just the start up parameters?

 

[Stillent]

Do you have an expo ram option in the bios?

Hello Bob.B,

Yes, the expo ram option is a drop down that appears when you boot into the Basic Bios and there is just a drop down to enable, although in the advance I think there were other options but I am not sure if those automatically change setting for you as well.

For what it is at the moment after I updated my bios I had also enables the Expo settings and then saved the changed it made with it selected as usual.

 

[Bob.B]

Hello Bob.B,

Yes, the expo ram option is a drop down that appears when you boot into the Basic Bios and there is just a drop down to enable, although in the advance I think there were other options but I am not sure if those automatically change setting for you as well.

For what it is at the moment after I updated my bios I had also enables the Expo settings and then saved the changed it made with it selected as usual.

You said you enabled xmp do you have both expo and xmp options in the bios?

 

[Stillent]

You said you enabled xmp do you have both expo and xmp options in the bios?

I'll need to wait till Thursday to check, stay tuned. However looking at my MB manual I think I am beginning to get your jist, as if Pg. 6 is to be believed then I might have seleted timings that Asus has set rather then the what is on the Ram. I think I need to go and change the clock Dram option as in pg 16/17. Thoughts?

 

[Bob.B]

I'll need to wait till Thursday to check, stay tuned. However looking at my MB manual I think I am beginning to get your jist, as if Pg. 6 is to be believed then I might have seleted timings that Asus has set rather then the what is on the Ram. I think I need to go and change the clock Dram option as in pg 16/17. Thoughts?

I have no stick time playing with what you have so I won't comment.

Perhaps other members will give thoughts.

 

[Stillent]

I have no stick time playing with what you have so I won't comment.

Perhaps other members will give thoughts.

All good, thanks for your time and the insight to trouble shoot.

 

[Misgar]

Motherboard: Asus Prime x670-E-Pro Wifi

I've got an Asus Prime X670-P WiFi and I cannot recall seeing any EXPO specific settings in the BIOS, unless DOCP counts as EXPO?
https://www.technewstoday.com/docp-asus/

I might have seleted timings that Asus has set rather then the what is on the Ram.

The SPD (Serial Presence Detect) chip on each DIMM contains a bunch of timings, related to possible XMP (or in some instances EXPO) timings for use by the BIOS.

I have some DIMMs with up to seven SPD settings for exactly the same memory clock frequency, with the only difference being the CL (CAS) value. In the image below for DDR4 RAM, there are five timigs for 1600MHz (3200MT/s). In each case, the only value which changes is CL (16, 17, 18, 19, 20).

When the Asus BIOS checked your RAM during installation, it probably picked the fastest timings for each clock speed. If it cannot find an exact match to your requested speed, it extrapolates timings from the nearest speed above and below.

The net result is when you select DOCP-6000 in the memory overclock section of the Asus BIOS, it will load the fastest CL(CAS) setting held in the XMP table (or EXPO if present). This might be too fast for your CPU.

N.B. A large proportion of DIMMs come with only XMP timings in SPD, i.e. no EXPO tables.

XMP values are often OK for use with AMD Ryzen, but not always. If you've set DDR5-6000 in D.O.C.P. it might simply be too fast for your Ryzen 7 7800 X3D without some manual tweaking.

Either drop the memory overclock by one level, e.g. DDR5-5800 or DDR5-5600 and see if the system becomes more stable.

Alternatively, dive into the manual timings after setting DDR5-6000 and raise the value of CL(CAS) by one clock cycle. If, for example, CL=38 at 6000MT/s, increase CL to 39 for both DIMMs. Save and reboot. Run stability test. If it's still unstable, try CL=40. Note: Your CL may not be 38 at 6000MT/s. I didn't check.

Of course adding clock cycles to CL slows down memory access, but stability is more important than sheer speed. Intel CPUs tend to run faster XMP speeds than AMD.

If your DIMMs are not in the Asus QVL, there's a chance they might not be 100% stable when overclocked on your CPU. Some people warn against running Corsair Vengeance with AM5 Ryzens.

I run my 2 x 32GB Kingston Fury DDR5 DIMMs at 4800MT/s for stability in long video renders on my 7950X.

 

[Stillent]

I've got an Asus Prime X670-P WiFi and I cannot recall seeing any EXPO specific settings in the BIOS, unless DOCP counts as EXPO?
https://www.technewstoday.com/docp-asus/


The SPD (Serial Presence Detect) chip on each DIMM contains a bunch of timings, related to possible XMP (or in some instances EXPO) timings for use by the BIOS.

I have some DIMMs with up to seven SPD settings for exactly the same memory clock frequency, with the only difference being the CL (CAS) value. In the image below for DDR4 RAM, there are five timigs for 1600MHz (3200MT/s). In each case, the only value which changes is CL (16, 17, 18, 19, 20).

When the Asus BIOS checked your RAM during installation, it probably picked the fastest timings for each clock speed. If it cannot find an exact match to your requested speed, it extrapolates timings from the nearest speed above and below.

The net result is when you select DOCP-6000 in the memory overclock section of the Asus BIOS, it will load the fastest CL(CAS) setting held in the XMP table (or EXPO if present). This might be too fast for your CPU.

N.B. A large proportion of DIMMs come with only XMP timings in SPD, i.e. no EXPO tables.

XMP values are often OK for use with AMD Ryzen, but not always. If you've set DDR5-6000 in D.O.C.P. it might simply be too fast for your Ryzen 7 7800 X3D without some manual tweaking.

Either drop the memory overclock by one level, e.g. DDR5-5800 or DDR5-5600 and see if the system becomes more stable.

Alternatively, dive into the manual timings after setting DDR5-6000 and raise the value of CL(CAS) by one clock cycle. If, for example, CL=38 at 6000MT/s, increase CL to 39 for both DIMMs. Save and reboot. Run stability test. If it's still unstable, try CL=40. Note: Your CL may not be 38 at 6000MT/s. I didn't check.

Of course adding clock cycles to CL slows down memory access, but stability is more important than sheer speed. Intel CPUs tend to run faster XMP speeds than AMD.

If your DIMMs are not in the Asus QVL, there's a chance they might not be 100% stable when overclocked on your CPU. Some people warn against running Corsair Vengeance with AM5 Ryzens.

I run my 2 x 32GB Kingston Fury DDR5 DIMMs at 4800MT/s for stability in long video renders on my 7950X.

Wow thanks for the amazing detailed breakdown, can't wait to try it out!

So I do have the EXPO setting on my DRAM, the ram in question is specifically this one: https://www.gskill.com/product/165/390/1661410135/F5-6000J3038F16GX2-TZ5NR

If I recall correctly I was very careful on my MB to DRAM choice in terms of compatibility and as far as I am aware this memory is listed as being compatible with that particular motherboard. As for the CPU choice I don't think the pairing matters as much, is marketing is to be believed the MB is intended for the 7000 series with DDR5 support and I think the x3d variant was midway out last year so I think the support was there in terms of use.

I think my approach on letting Asus take the wheel on the EXPO settings was too hands off and looking around I would need go through he Ai Tweaker and select the profile there, as even G.Skill has the screenshots on their FAQ on how to set it.

Misgar, just to bring it back for a moment, this Cold Boot issue only appeared after updating my BIOS substantially. I did not have any issues running the system with the simplistic setting process until this exact point, perhaps the system wasn't as sensitive?

Overall based on the discussion the cold boot issue is DRAM driven and if that doesn't workout then I BIOS reset (which in itself could affect the DRAM EXPO settings) next. That's the plan for Thursday, so stay tuned.

 

[Misgar]

do I do have the EXPO setting on my DRAM,

Yes it does say you have EXPO. Despite having a number of AMD CPUs, I don't have any EXPO RAM myself.

this Cold Boot issue only appeared after updating my BIOS substantially.

When you update the BIOS, it may remove some/all of the tweaks you made in the old BIOS. For example, I often find the BIOS update has switched off "Virtualization" required to run Hyper-V.

After updating the BIOS, you are advised to load system defaults and (hopefully) obtain a stable first boot.

You might have to change the default boot drive setting, if like me, you have more than one bootable drive in the machine.

Other settings might include selecting the main GPU card instead of the iGPU. Disabling full screen logo, enable third-party ROMs, change fan speed profiles, etc. These should not affect stability though.

In your case that doesn't seem to have happened (yet), if you still have trouble with a cold boot.

Are you overclocking your memory to 6000MT/s? If so, temporarily disable EXPO and set the RAM back to the JEDEC default (probably 4800MT/s).

Power the system on and off a few times. Switch off the mains supply to ensure a cold boot next time. Experiment for a while and see if the system becomes more stable. If so, the memory overclock is probably the culprit.

If the system is stable at 4800MT/s, gradually increase the EXPO speed setting in small increments, e.g. try 5000MT/s first. Check for the cold boot problem. Run a short stress test.

If the system is stable at 5000MT/s, increase EXPO one step, e.g. 5200MT/s. Repeat the startup tests and run another short stress test.

Continue on to 5400MT/s, 5600MT/s, 5800MT/s, before setting 6000MT/s. You might find a speed where the system becomes unstable.

Of course this assumes your BIOS allows you to make 200MT/s increments. It might only allow 400MT/s steps.

If you reach an EXPO setting where instability sets in, either back off the speed by one notch, or start making manual adjustments to CL/CAS.

Ryzens can spend several minutes in a new build (or maybe after a BIOS update) attempting to "re-train" DDR5 memory. If you're lucky, the system will settle down after a few training sessions as the BIOS sorts things out.

Unless you are well versed in the art of manual memory tweaking to configure the dozens of Primary, Secondary and Tertiary timings by hand, it's best to let the BIOS pick the appropriate settings out of the SPD on the DIMMs.

Many problems are due to over-enthusiastic XMP/EXPO overclocks. Other problems are due to unfortunate combinations of CPU, RAM and motherboard.

You've been careful and chosen RAM with EXPO settings. Other people have bought Corsair Vengeance DDR5 with no EXPO tables and had stability issues with AM5 systems.

Search online for other people with your CPU, RAM and mobo combination. You might find someone else with the same problem.