Question GPU temp Spike in a second

Dec 30, 2020
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it happens 2 weeks ago when my pc boot normaly, but there's no display. and this usually happens because of the power monitor and i already fixed it.
i run kombuster to check and benchmark to see anything wrong with my gpu. this picture below is before benchmark

https://i.postimg.cc/Gp2m80pj/before-bench.png
and this one below if after benchmark
https://i.postimg.cc/RCc40CRB/after-bench.png


as you can see, and my gpu suddenly has a spike temp from 36 to 90 degrees Celsius. but when i touch the backplate, it doesn't feel 90 degrees at all. it's almost like 30-40 celcius.
so i applied new thermal paste and thermal pad, the results are same from before a sudden thermal spike, and this time it happens when i boot, because my fan immediately have 100% spin.

i try removing bios, ram, also change the pci-e for gpu. but nothing change.
i use HW monitor, afterburner, and GPU-Z to check correlation between those app when i have a spike. and it confused me.

yesterday when my gpu had a temp spike, i immediately turning off my pc and open my gpu, when touch the part that have thermal pad and my GPU processor using a handkerchief it doesn't hot at all.
my last resort is try to reinstall my pc. but i dont want too. because there's to much data to move.

please friend any input will be help for me. (sorry i dont speak english very well)

Thanks in advance
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System Information report written at: 12/30/20 19:12:20
System Name: SUGEKNIGHT
[System Summary]

Item Value
OS Name Microsoft Windows 10 Enterprise
Version 1 0.0.18363 Build 18363
Other OS Description Not Available
OS Manufacturer Microsoft Corporation
System Name SUGEKNIGHT
System Manufacturer Micro-Star International Co., Ltd.
System Model MS-7B45
System Type x64-based PC
System SKU Default string
Processor Intel® Core™ i7-8700K CPU @ 3.70GHz, 3696 Mhz, 6 Core(s), 12 Logical Processor(s)
BIOS Version/Date American Megatrends Inc. A.B0, 05/06/2020
SMBIOS Version 2.8
Embedded Controller Version 255.255
BIOS Mode Legacy
BaseBoard Manufacturer Micro-Star International Co., Ltd.
BaseBoard Product Z370 GAMING PRO CARBON (MS-7B45)
BaseBoard Version 2.0
Platform Role Desktop
Secure Boot State Unsupported
PCR7 Configuration Binding Not Possible
Windows Directory C:\WINDOWS
System Directory C:\WINDOWS\system32
Boot Device \Device\HarddiskVolume1
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Intel i7 8700k
Gigabyte 1070 Ti Gaming 8G
Trident.z 8Gb 2x
MSI Z370 Gaming Pro Carbon
EVGA 500 BV 80+ Bronze
 

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