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3950X, Dead cores on cold boot

Cutbait
By Cutbait
in Troubleshooting
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Greetings friends

 

Recent build here with the Crosshair VIII Hero and a 3950x, completed Dec 24. Running great with 2 x 16GB G.SKILL TridentZ. Very happy with the performance of the board and CPU and Ram.
Benchmarks have been great and system has been very stable with everything I've thrown at it.

But I do have a problem that has me puzzled, Occasionally on a cold boot as many as 8 cores on my 3950x are basically shut down, showing 566MHz. the dead cores remain inactive through cinebench run.
It has done this on stock bios (1201) on optimized defaults once at least. And a few more times since I've updated my memory profile. No OC yet on CPU,  all auto settings, other than some memory and fabric stuff.

 The dead cores on cold boot occurs maybe once every  three  or four days.

But I just reboot and the system will return to normal, all cores running as they should. Extremely stable and fast, stock settings will get 9400 + Cinebench scores. System will handle any extensive task I throw at it.
Karhu Ram test stable, 7 hour + run.

 

I am thinking bios or chipset issue, I just installed latest AMD chipset drivers, so I am in a wait and see mode. Patiently waiting on a new Agesa/Bios version soon

I have included two screen shoots with the system borked, various cores dead, and another after reboot running flawless229905280_Screenshot(8).thumb.png.e1a9e13650da462c6beebf7517dc9eeb.png1618688914_Screenshot(13).thumb.png.947d09131faeeecba0fa8bed726e6083.png1399191272_Screenshot(4).thumb.png.6d6a553abd8fe6fd78b63ac5141d7ccc.png

Any input on the dead cores on cold boot would be greatly appreciated

 

I can not recreate said issue on a reboot, only happens on a cold boot up.

 

Thank you so much for reading this!

Any input appreciated

 

system specs

 

Windows 10 x64

AMD Ryzen™ 9 3950X

ROG Crosshair VIII Hero (WI-FI)
G.SKILL TridentZ RGB Series 32GB (2 x 16GB) F4-3600C16D-32GTZR
SAMSUNG 970 PRO M.2 2280 1TB PCIe
EVGA SuperNOVA 1000 P2 80 PLUS PLATINUM Certified 1000W

Custom dual radiator loop with ek d5 dual pumps and block

 

 

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Things that make you go hmmm...  Be interesting to see confirmation on that one.  Makes me wonder if AMD is shutting down cores to boost single thread.

Not a pro, not even very good.  I’m just old and have time currently.  Assuming I know a lot about computers can be a mistake.

 

Life is like a bowl of chocolates: there are all these little crinkly paper cups everywhere.

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Haven't experienced this issue with my 3950X and Crosshair VIII Impact.

 

That cache and memory benchmark is very strange. The result is more in line with a 3600 or anything with a single chiplet. 

 

Could be some bizarre board issue.

 

Our Grace. The Feathered One. He shows us the way. His bob is majestic and shows us the path. Follow unto his guidance and His example. He knows the one true path. Our Saviour. Our Grace. Our Father Birb has taught us with His humble heart and gentle wing the way of the bob. Let us show Him our reverence and follow in His example. The True Path of the Feathered One. ~ Dimboble-dubabob III

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2 minutes ago, DildorTheDecent said:

Haven't experienced this issue with my 3950X and Crosshair VIII Impact.

 

That cache and memory benchmark is very strange. The result is more in line with a 3600 or anything with a single chiplet. 

 

Could be some bizarre board issue.

 

More hmm..

 

maybe get the Linus on this one.  He’s got all kinds of toys to play with.  Or not.  Might be nothing there.

Not a pro, not even very good.  I’m just old and have time currently.  Assuming I know a lot about computers can be a mistake.

 

Life is like a bowl of chocolates: there are all these little crinkly paper cups everywhere.

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More hmm is right.....

 

Just a few ago it happened again, this time all cores at 565.6 MHz and other strange readings on HWINFO64

So not dead cores really. Cold boot startup again

 

Rebooted and all normal again, except for my nerves...

going to post some screen shoots for ya

 

Thinking motherboard now?

 

 

316667454_Screenshot(24).thumb.png.d7997c768b2529a206947bb7dac51050.png1015152579_Screenshot(25).thumb.png.04bc1bddb6c03da2f5e0564fcee074b9.png1959041853_Screenshot(26).thumb.png.38dd784ec4e463d01bd499c63066a3c0.png458661775_Screenshot(27).thumb.png.4649ab6050c2deac2ddd8ad4b6f7ded7.png

 

 

 

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Reboot and the vital signs seem ok to me, for all I know.

 

Darn cold boot jinx....

 

I may never shut my system off again, lol

 

 

 

 

Screenshot (39).png

Screenshot (38).png

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Asked for you on a Taiwanese forum, they seemed to think that it's the CPU because this has happened with 1st gen, early stepping CPUs sometimes do that and the solution is to send it back for RMA. I dont think there's another stepping other than B0 for Zen 2 though

CPU: i7-2600K 4751MHz 1.44V (software) --> 1.47V at the back of the socket Motherboard: Asrock Z77 Extreme4 (BCLK: 103.3MHz) CPU Cooler: Noctua NH-D15 RAM: Adata XPG 2x8GB DDR3 (XMP: 2133MHz 10-11-11-30 CR2, custom: 2203MHz 10-11-10-26 CR1 tRFC:230 tREFI:14000) GPU: Asus GTX 1070 Dual (Super Jetstream vbios, +70(2025-2088MHz)/+400(8.8Gbps)) SSD: Samsung 840 Pro 256GB (main boot drive), Transcend SSD370 128GB PSU: Seasonic X-660 80+ Gold Case: Antec P110 Silent, 5 intakes 1 exhaust Monitor: AOC G2460PF 1080p 144Hz (150Hz max w/ DP, 121Hz max w/ HDMI) TN panel Keyboard: Logitech G610 Orion (Cherry MX Blue) with SteelSeries Apex M260 keycaps Mouse: BenQ Zowie FK1

 

Model: HP Omen 17 17-an110ca CPU: i7-8750H (0.125V core & cache, 50mV SA undervolt) GPU: GTX 1060 6GB Mobile (+80/+450, 1650MHz~1750MHz 0.78V~0.85V) RAM: 8+8GB DDR4-2400 18-17-17-39 2T Storage: HP EX920 1TB PCIe x4 M.2 SSD + Crucial MX500 1TB 2.5" SATA SSD, 128GB Toshiba PCIe x2 M.2 SSD (KBG30ZMV128G) gone cooking externally, 1TB Seagate 7200RPM 2.5" HDD (ST1000LM049-2GH172) left outside Monitor: 1080p 126Hz IPS G-sync

 

Desktop benching:

Cinebench R15 Single thread:168 Multi-thread: 833 

SuperPi (v1.5 from Techpowerup, PI value output) 16K: 0.100s 1M: 8.255s 32M: 7m 45.93s

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9 hours ago, Jurrunio said:




Asked for you on a Taiwanese forum, they seemed to think that it's the CPU because this has happened with 1st gen, early stepping CPUs sometimes do that and the solution is to send it back for RMA. I dont think there's another stepping other than B0 for Zen 2 though






Thank you very much Jurrunio for reading my post and bringing my situation to the Taiwanese forum. You are awesome

I may begin the RMA process for my CPU soon.

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