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Question Temps for a Core i5-8365U?

I'm running memtest86 on a laptop and the CPU temp (according to memtest86) is peaking at 98C. Does anyone here have experience of this processor to say that this is in the realm of normalhood? The fan is going full-tilt seemingly, and while I haven't checked the idle temps, the laptop was virtually silent.

I'm not dealing with a stability issue, I'm just wondering if I need to clean out the heatsink.

- edit - idle temp: It appears to be fluctuating between about 47-53C (after having settled down and rebooted after memtest86)
 
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A quick google search will tell you that this CPU can peak at 99°C before throttling occur, two exemple here :


 
Thanks for the responses. One thing I thought was curious about this laptop was that after I let it idle, I ran a cpu-z benchmark which takes maybe 15 seconds to run. During most of that time, the CPU temp was going way up yet the fan hadn't responded, then when the processor hit about 97C, *then* the fan kicked in. It reminds me of Lenovo's "ultra quiet mode", so I'm going to have a trawl through the BIOS for something similar with this Dell laptop.
 
As I expected, I found a setting in the Dell BIOS under Power Management, it was set to optimised, but out of the four settings in total, 'ultra performance' seemed to do what I want: Clock to the max, but have the fan keeping it as cool as possible. When I set it to that, the fan switched off when the processor cooled down, but didn't let the temp go up as high.
 
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