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Good CPU stress testing program for laptop undervolt

Hello there! :)

 

I undervolted my laptop's processor to -95 mV using Intel XTU. It was stable for a 5-minute stress test within XTU. Now, I'm going to be testing again for long-term stability, but what program should I use and how long should I run it?

 

My CPU btw is an Intel Core i5-4210H.

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Run Prime95 with small FFTs for at least 5 hours. 

New Build (The Compromise): CPU - i7 9700K @ 5.1Ghz Mobo - ASRock Z390 Taichi | RAM - 16GB G.SKILL TridentZ RGB 3200CL14 @ 3466 14-14-14-30 1T | GPU - ASUS Strix GTX 1080 TI | Cooler - Corsair h100i Pro | SSDs - 500 GB 960 EVO + 500 GB 850 EVO + 1TB MX300 | Case - Coolermaster H500 | PSUEVGA 850 P2 | Monitor - LG 32GK850G-B 144hz 1440p | OSWindows 10 Pro. 

Peripherals - Corsair K70 Lux RGB | Corsair Scimitar RGB | Audio-technica ATH M50X + Antlion Modmic 5 |

CPU/GPU history: Athlon 6000+/HD4850 > i7 2600k/GTX 580, R9 390, R9 Fury > i7 7700K/R9 Fury, 1080TI > Ryzen 1700/1080TI > i7 9700K/1080TI.

Other tech: Surface Pro 4 (i5/128GB), Lenovo Ideapad Y510P w/ Kali, OnePlus 6T (8G/128G), PS4 Slim.

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