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. 

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?

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. 

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.

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. 

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.

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. 
 

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.

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. 

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.