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Question "WHEA_UNCORRECTABLE_ERROR" BSOD when running 4 cores ?

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R

Rockya

Nov 30, 2024
10
0
10
Motherboard: Asus Prime Z270-A
CPU: Intel i7-7700K

Running the i7700k with BIOS set to ALL cores boots fine but causes BSOD WHEA_UNCORRECTABLE_ERROR, after a few minutes of normal browsing, file open etc.

If I select 3 cores in the BIOS it runs great very stable, and fast. Never any BSODs.

All other settings in the BIOS are defaults, no over clocking, no tweaking at all.

Running the Intel Processor Diagnostic when 3 or 4 cores active says CPU 1 passes. Max temp when running is 78 degrees on CPU and 79 degrees on package and cores. Data from CPUID HWQ Monitor.

I have tower air cooler.

Any suggestions on how to get all 4 cores running and stable? I want to run DAW music software and plugins which are demanding.

Many thanks
Rocky A
 
Not tried undervolting that but makes some sense. I have to set non turbo on boot to allow PC to boot up on 4 cores. So I think it could be something to do with voltage.

Also, at start up, the PC often switches on , then immediately off and then back on again.

I have just downloaded the intel extreme tuning utility. I will restart now and report back.

Thank you.
 
KingLoki said:
👍
Click to expand...
Hi KingLoki

I tried to cut an paste in the extreme tuning page but it wont paste.

In compact view there is a "power and current limits Optimized" banner. If I hover over that it says "Active and default values for power and current are already at or above the optimized limits set by this tool.

The bench mark is 1391 using 3 cores. Not tried 4 cores yet as it usually just hangs after 5 mins.

In advance view the screen is blank. No tuning controls appear.

Byron
 
Make sure your chipset driver and Intel Management Engine (IME) driver are the latest versions.Visit the motherboard manufacturer's official website to download and install the latest drivers.
 
Rockya said:
It is very odd.

1 Asus Z270-A running on latest bios, namely 1302
2. Uses Intel® Z270 chipset
3. All drivers downloaded and up to date on Intel driver and support site
4 Windows all updated via Windows Update
5 Uninstalled utility and re-installed. About to restart!
Click to expand...
Same issue. Extreme Utility shows power and current limits optomized. Nothing showing in advance view.
 
Try msconfig to not load startup items.

Type "msconfig" (no quotes)
Click "Selective Startup"
Untick "Load Startup Items"
Click "Apply" then "OK"
Then restart the computer and run the utility as administrator
 
KingLoki said:
Try msconfig to not load startup items.

Type "msconfig" (no quotes)
Click "Selective Startup"
Untick "Load Startup Items"
Click "Apply" then "OK"
Then restart the computer and run the utility as administrator
Click to expand...
Tried the above. Still no options in compact or advance view.

I downloaded the Intel Management Engine and ran setup. Does it just load drivers? There is no Intel Management Engine utility to run. Is that correct?
 
So strange that it blanks out and no settings. Have not had that happen before. It should work with your cpu.
You can slightly undervolt the cpu in the bios to try and see if it works. Small increments and test.
 
It certainly sounds like your CPU has had it. Did you ever overclock it? You could try downclocking the CPU and see if that makes any diff. in stability.
You should be able to pick up a kabylake replacement CPU dirt cheap these days. I'm not sure if anything newer would work in a z270 chipset motherboard though.
 
KingLoki said:
Did you try the undervolt idea in the bios?
Below is intel's cpu diagnostic tool.

https://www.intel.com/content/www/us/en/download/15951/19792/intel-processor-diagnostic-tool.html
Click to expand...
Hello again, sorry for the delay.. Work gets in the way of all my fun!

I reached out to Intel support but still cannot get the XTU to see any of the CPU. The guy offered to replace the processor until he realised it was from 2017!

I did download Throttlestop and currently have the following undervoltage....

CPU Core offset, -54.7mv, so voltage down to 1.2998
CPU Casche offset, -54.7mv, voltage down to 1.2998
Intel GPU offset, -25.4
Was not sure what to do with System Agent.

CPU has higher score that initial benchmark at this level in CPU-Z bench test and stable but will not even boot on 4 cores. As soon as I switch the BIOS to ALL cores, it goes splatt BSOD!

Interestingly the 3 cores are running at 4700 Mhz, so maybe I should bring that down using smaller CPU ratio? It is currently 47.

My memory is Corsair 2 X 8GB DDR4 2133, but appears to be running at 3200? According to my BIOS.
 
80251 said:
It certainly sounds like your CPU has had it. Did you ever overclock it? You could try downclocking the CPU and see if that makes any diff. in stability.
You should be able to pick up a kabylake replacement CPU dirt cheap these days. I'm not sure if anything newer would work in a z270 chipset motherboard though.
Click to expand...
I never overclocked it. I think the latest processor is a i9 9900k that fits the LGA1151 socket in my z270-a motherboard. Anyone ever tried an ES version?
 
Rockya said:
Hello again, sorry for the delay.. Work gets in the way of all my fun!

I reached out to Intel support but still cannot get the XTU to see any of the CPU. The guy offered to replace the processor until he realised it was from 2017!

I did download Throttlestop and currently have the following undervoltage....

CPU Core offset, -54.7mv, so voltage down to 1.2998
CPU Casche offset, -54.7mv, voltage down to 1.2998
Intel GPU offset, -25.4
Was not sure what to do with System Agent.

CPU has higher score that initial benchmark at this level in CPU-Z bench test and stable but will not even boot on 4 cores. As soon as I switch the BIOS to ALL cores, it goes splatt BSOD!

Interestingly the 3 cores are running at 4700 Mhz, so maybe I should bring that down using smaller CPU ratio? It is currently 47.

My memory is Corsair 2 X 8GB DDR4 2133, but appears to be running at 3200? According to my BIOS.
Click to expand...
So I dropped the CPU ratio down to 42, on the 3 cores, rebooted into the bios, set to ALL cores and it booted and so far is stable on 4 cores. CPU-Z bench mark is 494 single, and 2368 multi at 4200Mhz, and the -54.7mv undervolt.

Awesome! Thank you KingLoki and 80251.

The combination of undervolting and clocking to the standard 4200Mhz did the trick. I will keep it like this until proven to be stable and maybe very slowly tweak the voltage and CPU ratio to get the maximum bench test with stability.

I guess, you guys are normally trying to overclock and overvolt and here I am doing the very opposite but at least now it is 4 cores and stable, with a decent benchmark compared to reference on CPU-Z. I have learned some stuff and can now experiment. Thank you again for your advice.
 
Will a 9900k really work in a z270 board? I had thought a z370 was the oldest chipset to support the 9900k and then only if the VRM was unusually robust.
 
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