CPU surges immediately to 100 degrees and cooling slows under load during stress tests

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Razlorus
Posting Freak

976

03-20-2019, 02:30 PM

#1

Hello everyone, I'm just starting this project by taking apart a working CPU from a friend. Right now I'm experiencing sudden throttling during stress tests, even though my idle temps are normal. When I run Prime95 with smaller FFTs, the temperature spikes to 90-100°C and the CPU slows down. I've attached the relevant WHinfo graphs (full CSV included).

My setup details: CPU – Intel Core i7-4790K, cooler – DARK ROCK 4 with Arctic MX4 paste, motherboard – GIGABYTE Z97-D3H-CF, BIOS – latest, RAM – 32GB (8GB×4), memory controller – GSkill F3-2133C10-8GSR, running at 2133 MHz xmp profile, PSU – Thermaltake smart 700W, GPU – ASUS RTX 2070 SUPER EVO OC, SSD – 256GB S3C, HDD – 2TB Toshiba DT01ACA200, OS – Windows 10 x64 22H2.

I've changed coolant twice and applied new MX-4 paste in a cross pattern, but the problem still occurs with every installation. Could you help figure out what's causing this? Any suggestions on further testing would be appreciated! Thanks a lot.

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SwagShamann
Member

68

03-28-2019, 05:17 PM

#2

After reinstalling the cooler, the BIOS might have restarted, potentially erasing earlier fan settings.

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Cupcake_Rose
Posting Freak

844

03-31-2019, 11:12 PM

#3

Such a rapid rise in heat often indicates an impending storm.

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HubixCube
Member

166

04-01-2019, 02:46 AM

#4

It might be worth noting that even the TIM beneath the IHS could be faulty. At that point, Intel didn't apply solder during this period. Additionally, prime95 is expected to stress the CPU more than usual under regular workloads.

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teddybear116
Member

232

04-01-2019, 11:18 AM

#5

the fans are positioned to work together, and stress tests push the CPUs beyond typical levels so you can experiment with other tasks. if it doesn’t trigger any throttling, everything should be okay.

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RulwenJr
Posting Freak

786

04-01-2019, 12:46 PM

#6

What speed are you seeing at that temperature? It seems the fan might only reach 2800 RPM, not 1000. Check the cooler's bottom for any issues. My estimate suggests the fan direction might be working against the exhaust.

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DonMcOne
Member

188

04-01-2019, 01:44 PM

#7

It's a 4790K, and I'm familiar with this chip. Several games often set it to 100%, particularly when using a 2070S.

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ChubbsPlaysYT
Member

51

04-19-2019, 10:11 AM

#8

I'll review the bios fan curves now. The CPU fan curve is set to normal. The fan speed is approximately 1300 rpm. Are you referring to the cooler's mounting on the CPU socket or the backplate of the cooler on the motherboard? I haven't adjusted it yet, but it seems all screws are secure. It's possible the rear fan was installed incorrectly. Currently I'm directing air into the fins (pull) and pushing it out through the case (push). Should the CPU fan direct air into the fins or away from them? I can't install it on the RAM side due to space constraints.

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TheWetCow
Junior Member

29

04-19-2019, 11:05 AM

#9

This phrase also applies to situations outside everyday contexts.

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Clareesuh
Member

245

05-07-2019, 06:45 AM

#10

I think the CPU is okay because it functioned properly on my friend's machine recently