evgasjtx59
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I'm randomly getting post code D4 when trying to boot up my Z790 classified. Does anyone know what might cause this?
D4 error code is pci resource allocation error. Out of resources. I'm only using 1 gpu with no nvme drives.
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Cool GTX
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Re: Occasional post failure with code D4 Z790 Classified
2024/10/21 06:30:24
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evgasjtx59
I'm randomly getting post code D4 when trying to boot up my Z790 classified. Does anyone know what might cause this?
D4 error code is pci resource allocation error. Out of resources. I'm only using 1 gpu with no nvme drives.
Turning Fast Boot OFF in BIOS, would be the first thing I always do What is your experience level, you are new here (low post count) How confident are you about how you assembled the PC, especially the CPU & coole? ---> not damaging MB socket pins ---> that you kept CPU cooler level while tightening ---> did not over tighten the cooler?
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evgasjtx59
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Re: Occasional post failure with code D4 Z790 Classified
2024/10/21 10:45:51
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Cool GTX
evgasjtx59
I'm randomly getting post code D4 when trying to boot up my Z790 classified. Does anyone know what might cause this?
D4 error code is pci resource allocation error. Out of resources. I'm only using 1 gpu with no nvme drives.
Turning Fast Boot OFF in BIOS, would be the first thing I always do
What is your experience level, you are new here (low post count)
How confident are you about how you assembled the PC, especially the CPU & coole?
---> not damaging MB socket pins
---> that you kept CPU cooler level while tightening
---> did not over tighten the cooler?
Fast boot is already turned off. Booting mode is legacy. I'm pretty confident in my abilities. No damage to any of the pins. Cpu is 13900ks with thermalright contact frame and only tightened till it hits a slight resistance wall. Cpu cooler is thermalright phantom spirit evo 120 and tightened each mounting screw alternatively.
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bdary
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Re: Occasional post failure with code D4 Z790 Classified
2024/10/21 10:58:09
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evgasjtx59
Cool GTX
evgasjtx59
I'm randomly getting post code D4 when trying to boot up my Z790 classified. Does anyone know what might cause this?
D4 error code is pci resource allocation error. Out of resources. I'm only using 1 gpu with no nvme drives.
Turning Fast Boot OFF in BIOS, would be the first thing I always do
What is your experience level, you are new here (low post count)
How confident are you about how you assembled the PC, especially the CPU & coole?
---> not damaging MB socket pins
---> that you kept CPU cooler level while tightening
---> did not over tighten the cooler?
Fast boot is already turned off. Booting mode is legacy.
I'm pretty confident in my abilities. No damage to any of the pins. Cpu is 13900ks with thermalright contact frame and only tightened till it hits a slight resistance wall. Cpu cooler is thermalright phantom spirit evo 120 and tightened each mounting screw alternatively.
Are you running Windows 10 or 11?? If so, you might want to try booting in UEFI mode and NOT legacy. See if that helps. You may also want to make sure Windows "Fast Startup" is disabled in the Windows Power Option settings. If it was enabled before, you'll need to reboot to return to normal.
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evgasjtx59
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Re: Occasional post failure with code D4 Z790 Classified
2024/10/21 11:51:38
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bdary
Are you running Windows 10 or 11?? If so, you might want to try booting in UEFI mode and NOT legacy. See if that helps. You may also want to make sure Windows "Fast Startup" is disabled in the Windows Power Option settings. If it was enabled before, you'll need to reboot to return to normal.
I'm running Windows 10 installed installed as legacy on an MBR drive. No issues with this setup on my z690 dark or z790 dark. Post code errors out before booting Windows.
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B0baganoosh
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Re: Occasional post failure with code D4 Z790 Classified
2024/10/21 12:51:49
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Can you tell us all your specs? What hardware do you have? What BIOS version are you running? Also, perusing this thread with two folks having a similar problem. They updated their BIOS and it fixed the issue for some.
6Q6CPFHPBPCU691 is a discount code anyone can use. i9 13900k - EVGA Z690 Classy - Nvidia RTX 4090 FE - G.Skill 64GB DDR5-6000CL30 - WD SN850 2TB NVMe Gen4 - Be Quiet! Straight Power 12 1200W - Be Quiet! Dark Base 900 Pro. MO-RA3 420 Pro. Dark Palimpsest MODS RIGS post for build notes.
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evgasjtx59
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Re: Occasional post failure with code D4 Z790 Classified
2024/10/21 13:02:47
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B0baganoosh
Can you tell us all your specs? What hardware do you have? What BIOS version are you running?
Also, perusing this thread with two folks having a similar problem. They updated their BIOS and it fixed the issue for some.
I'll take a look at that thread. Specs: Evga Z790 Classified 13900k stock Thermalright phantom spirit evo 120 air cooler 2x32gb ddr5 jdec speed Evga 980 ti classified Sata ssd boot drive formatted as mbr with Windows 10 Boot mode is legacy No other misc hardware as this is a temporary test bench setup and it's as barebones as you can get.
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B0baganoosh
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Re: Occasional post failure with code D4 Z790 Classified
2024/10/22 07:14:05
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My only guess other than hardware defect of some sort is an issue with your contact frame pressure. You can test this by putting the stock ILM back on and seeing if the problem goes away. I had a myriad of problems with the 12900k I had and any contact frame usage, but I think the major culprit was overtightening the water block (there are no springs and it doesn't bottom out, so no self-leveling mechanism and you just have to do it by feel). I tried every stage of barely on there to tight with the contact frame and it was quite a mess. The only thing that fixed it was getting rid of the contact frame and then easing back on block tightness. I haven't had any such issues with 13900k and a contact frame, but I've also learned a lot since that debacle. I'm not accusing you of doing something wrong, but sometimes stack-up of different types of brackets and pressures can cause misalignment of the CPU in the socket and intermittent pressure on the pins will cause chaos.
6Q6CPFHPBPCU691 is a discount code anyone can use. i9 13900k - EVGA Z690 Classy - Nvidia RTX 4090 FE - G.Skill 64GB DDR5-6000CL30 - WD SN850 2TB NVMe Gen4 - Be Quiet! Straight Power 12 1200W - Be Quiet! Dark Base 900 Pro. MO-RA3 420 Pro. Dark Palimpsest MODS RIGS post for build notes.
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evgasjtx59
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Re: Occasional post failure with code D4 Z790 Classified
2024/10/22 07:35:46
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B0baganoosh
My only guess other than hardware defect of some sort is an issue with your contact frame pressure. You can test this by putting the stock ILM back on and seeing if the problem goes away. I had a myriad of problems with the 12900k I had and any contact frame usage, but I think the major culprit was overtightening the water block (there are no springs and it doesn't bottom out, so no self-leveling mechanism and you just have to do it by feel). I tried every stage of barely on there to tight with the contact frame and it was quite a mess. The only thing that fixed it was getting rid of the contact frame and then easing back on block tightness. I haven't had any such issues with 13900k and a contact frame, but I've also learned a lot since that debacle.
I'm not accusing you of doing something wrong, but sometimes stack-up of different types of brackets and pressures can cause misalignment of the CPU in the socket and intermittent pressure on the pins will cause chaos.
I'll try it out. I have a G7400 coming to test with some more. I also just tried with the cooler just laying on top of the cpu, not screwed down or mounted and it still has intermittent D4 error code. The other weird thing, i original found this problem when i first switched from uefi boot to legacy. That's when i first got the D4 error. I then changed above 4g decoding and rebar from auto to disabled and kept legacy boot and it posted fine. I then changed them back to auto and it still posted fine. So it's been a completely intermittent issue. I wouldn't think it's the contact frame issue because I'm using Gamer's Nexus method in their review which is too walk down each screw by a quarter turn only and only tightening to get light pressure. I also haven't had any issues with the Z790 and Z690 dark.
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B0baganoosh
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Re: Occasional post failure with code D4 Z790 Classified
2024/10/22 08:32:57
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evgasjtx59
The other weird thing, i original found this problem when i first switched from uefi boot to legacy. That's when i first got the D4 error. I then changed above 4g decoding and rebar from auto to disabled and kept legacy boot and it posted fine. I then changed them back to auto and it still posted fine. So it's been a completely intermittent issue.
That is definitely interesting and sounds like a BIOS bug to me. I wonder if on Auto, it they were enabled, which was causing an issue with legacy boot (I think those require EUFI to work)...then when you disabled and went back to "auto" they were still disabled. So "auto" just left them in some previous state instead of switched them based on the other settings and hardware. Just a theory. If you leave them manually set to disabled, does it continue to boot correctly or was it just an intermittent chance? Similar to your plan, I bought a G6900 trying to test out the 7F code issue I was having and it worked perfectly fine (compared to the 12900k I couldn't get to boot right 100% of the time). As for comparisons with the Dark boards, I think the Classified boards are just a little thinner with a couple less copper layers so they might flex just a little more, which makes them more susceptible to uneven tightening. You're probably right that it isn't the issue, but it is something physically different between those boards and another reason I bought an aftermarket back-plate for behind the motherboard to stiffen things up on my z690 Classified. I'm going off memory from z690 announcements (can't remember z790 honestly) so I could be mistaken there.
6Q6CPFHPBPCU691 is a discount code anyone can use. i9 13900k - EVGA Z690 Classy - Nvidia RTX 4090 FE - G.Skill 64GB DDR5-6000CL30 - WD SN850 2TB NVMe Gen4 - Be Quiet! Straight Power 12 1200W - Be Quiet! Dark Base 900 Pro. MO-RA3 420 Pro. Dark Palimpsest MODS RIGS post for build notes.
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evgasjtx59
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Re: Occasional post failure with code D4 Z790 Classified
2024/10/22 09:37:39
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B0baganoosh
That is definitely interesting and sounds like a BIOS bug to me. I wonder if on Auto, it they were enabled, which was causing an issue with legacy boot (I think those require EUFI to work)...then when you disabled and went back to "auto" they were still disabled. So "auto" just left them in some previous state instead of switched them based on the other settings and hardware. Just a theory. If you leave them manually set to disabled, does it continue to boot correctly or was it just an intermittent chance?
Similar to your plan, I bought a G6900 trying to test out the 7F code issue I was having and it worked perfectly fine (compared to the 12900k I couldn't get to boot right 100% of the time).
As for comparisons with the Dark boards, I think the Classified boards are just a little thinner with a couple less copper layers so they might flex just a little more, which makes them more susceptible to uneven tightening. You're probably right that it isn't the issue, but it is something physically different between those boards and another reason I bought an aftermarket back-plate for behind the motherboard to stiffen things up on my z690 Classified. I'm going off memory from z690 announcements (can't remember z790 honestly) so I could be mistaken there.
Yeah i think I'm going to reflash the bios next and see if that helps. Also try other bios switches. The other weird thing is originally when i first went from uefi to legacy, i couldn't boot without also setting above 4g and rebar to disabled. After i DID get it to boot with those 2 disabled and legacy boot, i randomly had D4 boot failures even after multiple successful posts. This time though, i was able to hit reset and it posted the 2nd time. This is in contrast to earlier when i first set it to legacy it would get stuck on D4 until bios wipe and reboot/power off didn't fix it. Only other thing i could think of is the Z790 classified doesn't like my evga 980 ti classified. I've had other weird issues with it on my X299 Dark where there's no display out until Windows successfully posts. (No bios screen, etc) But will display perfectly after Windows boots and Nvidia drivers come up. There i had to use an old 8400 gs and it would display just fine. I'm starting to think it also could be an issue with loading the 980 ti upon post.
post edited by evgasjtx59 - 2024/10/22 09:42:21
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Cool GTX
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Re: Occasional post failure with code D4 Z790 Classified
2024/10/22 10:08:47
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FAQ: https://www.evga.com/support/faq/FAQdetails.aspx?faqid=59772 (excerpt) How to Enable Resizable BAR Support in EVGA Motherboards:For compatible EVGA motherboards, you must enable the "Above 4G Decoding" and "Re-Size BAR Support" settings, and disable "CSM Support". A full walkthrough of how to change these settings can be found below. - Note 1: The CSM Support option is available only if your Windows installation is configured for UEFI. If the motherboard Boot mode select must be set to Legacy, then you will be unable to enable Resizable Bar support. Although a full walkthrough of installing Windows in UEFI mode is outside the scope of this FAQ, here are a couple Microsoft documents that discuss the issue in more detail, along with a way to convert your hard drive from a legacy install to a UEFI install:
- Note 2: Changing your CSM Support setting can affect your ability to boot into Windows. The Compatibility Support Module is designed to allow you to use the benefits of UEFI with hardware that may not be UEFI compatible. Disabling the CSM is necessary for Resizable Bar support, but you may find that older hardware may not be compatible with CSM disabled. Although a full discussion on this topic is outside the scope of this FAQ, you may be able to resolve the issue through simple troubleshooting, such as a firmware update to the legacy device, or you may determine that your legacy device is simply outdated; it may be time to find a newer product with UEFI support.
Disable "CSM Support"Go into the Boot menu. Make sure your "Boot mode select" is "UEFI". If you normally boot into Windows using "Legacy" mode, please see Note 1 above, as you will be unable to properly enable Resizable Bar support. If the Boot mode is instead set to UEFI, you should see a menu further down called "CSM Configuration".
 CSM & Fast Boot ---> Must be off --- to turn CSM Off you want to use UEFI
Ask EVGA if the 980Ti Classy has a UEFI updated BIOS ---> Please contact EVGA Support at Support@EVGA.com
Make sure you load "default bios settings" before you flash your BIOS - many people seem to skip that step
https://forums.evga.com/FindPost/3407542 (excerpt below)
Since things are a little complicated with a lot of threads spread all over the place, I'm going to post all the relevant BIOS information we've given to people. If you don't see a BIOS you need, you can request it below. However, I'm making this thread mostly to inform people about some of the issues people run into when flashing their BIOS or having to update the MCU via Precision X1, so new BIOS additions will be a lower priority.
PSA#1: TURN OFF "FAST BOOT" IN YOUR MOTHERBOARD BIOS.
PSA#1: TURN OFF "FAST BOOT" IN YOUR MOTHERBOARD BIOS.
PSA#1: TURN OFF "FAST BOOT" IN YOUR MOTHERBOARD BIOS.
Longer PSA in spoilers. I strongly suggest that you read this at least once. It could prevent an RMA. Seriously.
Once again, turn off Fast Boot in your motherboard BIOS while you're playing around with flashing your BIOS. If fast boot is enabled, Windows will treat your card as the same GPU unless there's an obvious change, such as you change from a GeForce RTX 3080 to a GeForce RTX 3090, for example. Otherwise, Windows will just assume that nothing in your system has changed, including the DeviceID, which will change when you flash to a different BIOS version. Because Windows doesn't update the information automatically, it will give Precision X1 the wrong information, which is how many of you have run into an MCU flashing issue. If fast boot is disabled, Windows should check the DeviceID of each hardware component during each boot. It's still worth it to restart a couple times after flashing or flipping the switch over to a different BIOS to make sure everything is working normally.
So, please make sure to turn off Fast Boot until you are done flashing, and you've decided on which BIOS switch you want to use. At that point, you can restart and re-enable Fast Boot again, if you wish.
close
PSA#2: DISABLE CSM IN YOUR MOTHERBOARD BIOS BEFORE FLASHING A REBAR BIOS.
Longer PSA in spoilers. If you forget to disable CSM in your motherboard BIOS before flashing a ReBAR BIOS, then you may end up with a black screen upon your next boot. If you need to learn how to enable NVIDIA Resizable BAR, visit our FAQ: https://www.evga.com/support/faq/FAQdetails.aspx?faqid=59772
Spoiler
Learn your way around the EVGA Forums, Rules & limits on new accounts Ultimate Self-Starter Thread For New Members
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