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CPU Temperature Spikes to 100c at random!

So I just built my new pc recently and it was working great, then all of the sudden I just closed out a game and my cpu fan ramped up to 100%. My temps were around 65c while gaming before this so I know my cooler works. I opened openhardware monitor and saw that my cpu was pinned at 100c. Felt the air coming off my aio and it was cool, no heat other than maybe 40c worth, felt normal. So I took another fan and sandwiched my reused alienware aio with a push pull, and updated the bios (maybe it was a faulty temp reading and a bios update would have fixed it idk?). I didnt have the problem after that for maybe 5 days. Then since I have 2 new fans coming (because I was sacrificing both my case fans for the rad and had to jank on a 95mm as a makeshift case fan), I took one of the alienware fans from my alienware r6 and put it alone on the aio and put the case fans back, since it was a higher airflow fan. The same thing happened while I was closing a game, my fan ramped up to 100% and my temps were at 100c. For thermal paste I used corsair TM30 and applied enough. Does anyone have any idea whats going on? Is my cpu just giving faulty temp readings? Any solutions?

 

Edit: This only has happened a total of 4 times in the past 2 weeks with the most recent being today. Like I said i had a stretch of 5 days where I had a push pull and it was fine. After a restart it all goes back to normal.

 

CPU: i5-9600k

Mobo: ROG Strix b365-f gaming

AiO: Alienware Liquid Cooler

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Bad pump?

Before you reply to my post, REFRESH. 99.99% chance I edited my post. 

 

My System: i9-10900KF 5.1-5.3ghz @ 1.375v // Corsair iCUE H150i Elite Capellix // Gigabyte Z590 Aorus Elite AX // 32GB (4x8) Crucial Ballistix Elite DDR4 4000/CL18 // ASUS RTX 3080 TUF OC // Corsair 5000D Airflow // Corsair SP120 RGB Pro x7 // Seasonic Focus Plus Gold 850w //1TB ADATA XPG SX8200 Pro/1TB Samsung 860 EVO/2TB Seagate 7200RPM Hard Drive // Displays: LG Ultragear 32GP83B/Lenovo L24Q-30/Lenovo L24Q-30 // Glorious GMMK TKL // Corsair Harpoon Wireless // Corsair H70 Gaming Headset

 

Wife's System: i9-9900K Stock // Cryorig H7 Quad Lumi // Gigabyte Z390M Gaming // 32GB (4x8) Corsair Vengeance LED DDR4 3200 // ASUS KO RTX 3070 // Cooler Master Master Box NR400 ODD // Seasonic Focus Plus Gold 850w // 1TB ADATA XPG SX8200 Pro/1TB Samsung 860 EVO/4TB Western Digital HDD // Displays: LG Ultragear 27GL83A-B/AOC AGON AG241QX/ASUS VG248QE // Corsair K68 Mechanical Keyboard // Corsair Harpoon Wireless // LG BDRW // NexStar 5.25" USB 3 Enclosure

 

TV Gamer: i7-8700K 5.0ghz All-core delidded @1.375v // Deepcool Gamerstorm Assassin III // Gigabyte Aorus Z370 Gaming 5 // 32GB (4x8) Corsair Vengeance LPX DDR4 3200 // XFX 5700XT RAW II // Corsair 275R Airflow // Corsair 650M Vengeance 650w // Intel 660P 1TB NVME M.2 SSD/4TB Western Digital Blue // Display: 50" Westinghouse 1080p // Rii Wireless Mini Keyboard w/Touchpad/Xbox One Controllers

 

TV Gamer 2: Intel i3-10100 // ASRock H410M-HDV/M.2 // 16GB (2x8) DDR4 T-Force Vulcan 2666 // XFX RX 580 8GB XXX Edition // Rosewill FBM-X2 // Gigabyte P750GM // 480GB PNY CS1311 SSD/2TB Seagate HDD // Display: LG 50" 4k TV // Rii Wireless Mini Keyboard w/Touchpad/Xbox One Controllers Donated.

 

Son's System: i7-8700 // Cryorig H7 Quad Lumi // ASRock Z370 Extreme 4 // 16GB (2x8) GeIL Potenza DDR 3200 // EVGA XC RTX 3060 // Corsair 275R Airflow // EVGA Supernova G5 650W Gold // 525GB Crucial MX300/1TB WD SN550 // Display: ACER Nitro VG240Y PBiip / Dell P2417H // Corsair K60 Pro SE // Logitech G203

 

Daughter's System: i5-9400 // Cooler Master i71c // MSI H310M Pro VDH-Plus // 8GB (2x4) Leven DDR4 2666 (2400) // Zotac GTX 1060 3GB Mini // DarkFlash Micro ATX White // Corsair CX550 // 480GB PNY CS1311 SSD/2TB Seagate HDD // Display: ASUS VG245H // Redragon TKL Mechanic Keyboard + Mouse

 

Ryzen 5 1600 // Gigabyte B450 Aorus M Retired.

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Pump is running at 5000 rpm

 

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1 minute ago, Mister Woof said:

Bad pump?

Pump is running at 5000 rpm

 

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you might not have good contact with cpu. try reseating cpu and attaching cooler again.

ensure pump power if plugged into fan header does not have a variable power profile attached

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1 minute ago, tech.guru said:

you might not have good contact with cpu. try reseating cpu and attaching cooler again.

ensure pump power if plugged into fan header does not have a power profile attached

I reapplied thermal paste and reseated the aio this morning moving fans around. Will reseat the aio and reapply thermal paste tonight. Its hard to gauge whether it is a good solution because it happens far and few between. Thank you for your help!

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