Are constant 90-105 C spike temperatures normal?

Hi there :)

I’ve bought used MacBook 13 2015 - I’ve opened it up - definitely someone was messing with up inside.

I’ve put new thermal paste right away on CPU and GPU as Apple NEVER puts it on GPU - I’ve even added thermal pat to GPU only as I think there is gap between heatsink and die.

I’ve installed MacFanControl app as always and when I do some simple tasks like opening my iCloud informations in settings temperature on “CPU PECI” in MacFanControl spikes sometimes to 105C - while opening new tab with website in is MINIMUM 90C…… for few seconds then back to average 40C

I know about all CPU temps spikes but not like so massive and for so many seconds.

And I would not complain if I would not own MacBook Air 2014 - with exactly the same thermal paste and same MacFanControl settings where I just have like 60C MAX spikes and for much shorter time.

Partially I would suspect my applying that thermal pad on GPU increasing CPU temp (and increasing GPU speed as no GPU throttling as better cooling) - but still - why no such a temp spikes on MacBook Air - it still have similar Turbo Speeds.

Thank You for help - it would be great to confirm with person who has same model and have same or similar app installed to confirm temp spikes.

Here it is - but different app