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i5 8600K owers under stress

When using using prime95 under small FFT's (maximum heat, data fits in L2 cache, RAM not tested much), my temperature rises up to 85 degrees Celsius on average and my core speed on the cpu drops. My speed is usually 4.9GHz, but under the stress test it lowers to 3.8GHz. '

I switched to the blend test (tests some of everything, lots of RAM tested) and my core speed stayed 4.9GHz and celsius was lower on average, being around 75c. However the voltage raised from about 1.28 on the small FFT test to about 1.39 on the blend test. 

I have an i5 8600k and the CPU cooler Noctua NH-D14 set to full speed, along with four case fans set to full speed. 

Any suggestions? 

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Yes, I have 9 monitors.

My main PC (Hybrid Windows 10/Arch Linux):

OS: Arch Linux w/ XFCE DE (VFIO-Patched Kernel) as host OS, windows 10 as guest

CPU: Ryzen 9 3900X w/PBO on (6c 12t for host, 6c 12t for guest)

Cooler: Noctua NH-D15

Mobo: Asus X470-F Gaming

RAM: 32GB G-Skill Ripjaws V @ 3200MHz (12GB for host, 20GB for guest)

GPU: Guest: EVGA RTX 3070 FTW3 ULTRA Host: 2x Radeon HD 8470


SSDs: Guest: Samsung 850 evo 120 GB, Samsung 860 evo 1TB Host: Samsung 970 evo 500GB NVME

HDD: Guest: WD Caviar Blue 1 TB

Case: Fractal Design Define R5 Black w/ Tempered Glass Side Panel Upgrade

Other: White LED strip to illuminate the interior. Extra fractal intake fan for positive pressure.


unRAID server (Plex, Windows 10 VM, NAS, Duplicati, game servers):

OS: unRAID 6.11.2

CPU: Ryzen R7 2700x @ Stock

Cooler: Noctua NH-U9S

Mobo: Asus Prime X470-Pro

RAM: 16GB G-Skill Ripjaws V + 16GB Hyperx Fury Black @ stock



SSD: Samsung 970 evo NVME 250GB, Samsung 860 evo SATA 1TB 

HDDs: 4x HGST Dekstar NAS 4TB @ 7200RPM (3 data, 1 parity)

Case: Sillverstone GD08B

Other: Added 3x Noctua NF-F12 intake, 2x Noctua NF-A8 exhaust, Inatek 5 port USB 3.0 expansion card with usb 3.0 front panel header

Details: 12GB ram, GTX 1080, USB card passed through to windows 10 VM. VM's OS drive is the SATA SSD. Rest of resources are for Plex, Duplicati, Spaghettidetective, Nextcloud, and game servers.

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