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My i7 turned into a 3 core CPU

For months I've noticed some performance issues with my CPU. I thought it was my old I7-4770 from 2013 that's just getting outdated. I opened task manager and noticed one of my cores ''escaped''.

 

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Does anyone know what this means? Is my CPU broke?

I haven't changed any settings in my bios. 

 

CPU: AMD 3800X GPU: GTX 1080 Ti RAM: (16GB) 2x Corsair 8gb DDR4 3200Mhz Drives: SanDisk 240GB SSD, Samsung 500GB SSD, WD 1TB HDD

Motherboard: MSI X470 Gaming pro plus PSU: Gigabyte 650 watt Monitor(s): 27 inch AOC 1440p

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i think there is some setting in windows, where you can shut down cores, maybe that has happened to you somehow

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2 minutes ago, Devryd said:

i think there is some setting in windows, where you can shut down cores, maybe that has happened to you somehow

You can find this in msconfig as well as your BIOS.

Quote or tag me( @Crunchy Dragon) if you want me to see your reply

If my post solved your problem/answered your question, please consider marking it as "solved"

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Try running msconfig.  Click on the Boot tab, Advanced options... and make sure the Number of processors box is not checked.  Click on OK and reboot and see if Windows finds your lost core.

 

FACO2TC.png

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5 minutes ago, unclewebb said:

Try running msconfig.  Click on the Boot tab, Advanced options... and make sure the Number of processors box is not checked.  Click on OK and reboot and see if Windows finds your lost core.

 

FACO2TC.png

Thanks. I tried it but its unchecked. When I do check it, it only allows me to select cores up to 6 threads.

 

Resetting the bios also didnt solve the problem. Could it be that my 7 year old heavily used CPU has given the shits? 

CPU: AMD 3800X GPU: GTX 1080 Ti RAM: (16GB) 2x Corsair 8gb DDR4 3200Mhz Drives: SanDisk 240GB SSD, Samsung 500GB SSD, WD 1TB HDD

Motherboard: MSI X470 Gaming pro plus PSU: Gigabyte 650 watt Monitor(s): 27 inch AOC 1440p

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maybe try to check the cpu in a different motherboard if you have one. Or try to use a different CPU in that Motherboard.
I also heard of weird ram problems where reaseating the CPU helped. It's not the same, but i'd give it a try.

 

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Just now, Devryd said:

maybe try to check the cpu in a different motherboard if you have one. Or try to use a different CPU in that Motherboard

 

I don't have a spare 1150 motherboard laying around to try. I think I'm just gonna keep using this for now. I plan to upgrade to a newer ryzen in a month or two anyway. 

 

I googled the problem but couldn't find anything related to this problem. Weird.

CPU: AMD 3800X GPU: GTX 1080 Ti RAM: (16GB) 2x Corsair 8gb DDR4 3200Mhz Drives: SanDisk 240GB SSD, Samsung 500GB SSD, WD 1TB HDD

Motherboard: MSI X470 Gaming pro plus PSU: Gigabyte 650 watt Monitor(s): 27 inch AOC 1440p

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Maybe a friend of you has the same socket in the motherboard? A lot of my friends, for excample, also have socket am4.
I know it might not be necessary to find out why a core is missing, but now i am cuirous and would like to know it for myself.

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I think I have a pc at work somewhere that's using the same socket but I'm not sure. 

 

I'll continue to investigate and troubleshoot this problem. Never seen anything like this so I'm also very curious what this could've caused.

CPU: AMD 3800X GPU: GTX 1080 Ti RAM: (16GB) 2x Corsair 8gb DDR4 3200Mhz Drives: SanDisk 240GB SSD, Samsung 500GB SSD, WD 1TB HDD

Motherboard: MSI X470 Gaming pro plus PSU: Gigabyte 650 watt Monitor(s): 27 inch AOC 1440p

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Try clear CMOS, i.e. removing the CMOS battery and let it sit for a couple of minutes to reset BIOS back to factory defaults. 

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: 1TB HP EX920 PCIe x4 M.2 SSD + 1TB Seagate 7200RPM 2.5" HDD (ST1000LM049-2GH172), 128GB Toshiba PCIe x2 M.2 SSD (KBG30ZMV128G) gone cooking externally 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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47 minutes ago, dionkoffie said:

and noticed one of my cores ''escaped''.

This is why mounting pressure for your cooler is so important, keep em from getting out

I WILL find your ITX build thread, and I WILL recommend the SIlverstone Sugo SG13B

 

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i7 8086k (won) - EVGA Z370 Classified K - G.Skill Trident Z RGB - Force MP500 - Jedi Order Titan Xp - Hyper 212 Black (with RGB Riing flair) - EVGA G2 650W - Black and green theme, Razer brainwashed me.

Draws 400 watts under max load, for reference.

 

Linux Proliant ML150 G6:

Dual Xeon X5560 - 24GB ECC DDR3 - GTX 750 TI - old Seagate 1.5TB HDD - Dark moded Ubuntu (and Win7, cuz why not)

 

How many watts do I need? Seasonic Focus threadUserbenchmark (Et al.) is trash explained, PSU misconceptions, protections explainedgroup reg is bad

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Little update on my tripple core i7 beast.

 

Re-seated the CPU and fully inspected the pins plus the motherboard itself. Everything seems to be normal and the problem still isn't solved. 

I ran the Intel diagnostics test, but nothing strange resulted from that. It still thinks it's a legit happy 3 core CPU.

 

Investigation continues... 

TESTRESULTS.TXT

CPU: AMD 3800X GPU: GTX 1080 Ti RAM: (16GB) 2x Corsair 8gb DDR4 3200Mhz Drives: SanDisk 240GB SSD, Samsung 500GB SSD, WD 1TB HDD

Motherboard: MSI X470 Gaming pro plus PSU: Gigabyte 650 watt Monitor(s): 27 inch AOC 1440p

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There are programs existing that can help with that problem. 
You can let it park and unpark cores. Little back in time when i still had an intel i ran into the same problem. 
Using " Disable CPU Core Parking Utility " solved the issue for me. 
Maybe worth a try. 

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Does the BIOS tell you how many cores it sees?
You could also try downloading a Linux ISO, write it to a USB stick and boot that, see how many cores that can see.

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  • 2 weeks later...

I solved the issue.

 

I upgraded to a Ryzen 3800X. :) 

CPU: AMD 3800X GPU: GTX 1080 Ti RAM: (16GB) 2x Corsair 8gb DDR4 3200Mhz Drives: SanDisk 240GB SSD, Samsung 500GB SSD, WD 1TB HDD

Motherboard: MSI X470 Gaming pro plus PSU: Gigabyte 650 watt Monitor(s): 27 inch AOC 1440p

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8 minutes ago, dionkoffie said:

I solved the issue.

 

I upgraded to a Ryzen 3800X. :) 

but like... What happened to the core?? The mystery Remains!!
 

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Just now, The Torrent said:

but like... What happened to the core?? The mystery Remains!!
 

I have no clue. I sitll have my old PC but without a psu so maybe I'll come back when I have solved the problem because I'm obv not gonna sell it. I went to a pc store and told them about my issue. Even they didn't believe it. 

 

I'm pretty sure that the daily use of this CPU for the past 7 years has finally caught up to it. 

CPU: AMD 3800X GPU: GTX 1080 Ti RAM: (16GB) 2x Corsair 8gb DDR4 3200Mhz Drives: SanDisk 240GB SSD, Samsung 500GB SSD, WD 1TB HDD

Motherboard: MSI X470 Gaming pro plus PSU: Gigabyte 650 watt Monitor(s): 27 inch AOC 1440p

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Dude thats weird, you could try and find a cheap secondhand board on marktplaats.
I actually wanna know the problem now :D and maybe the solution

 

I am here to learn, please correct me if im wrong or you see me putting bs on your screen!

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