Question evga clc 280 8700k thermal thorttle

[deniselfmacario]

hey folks, im having an issue its very recent about a month after 6 months of use without any issues with thermal throttling, I have a 8700k a maximus x formula and evga clc 280 recently I been noticing that my overclock to 5 ghz is thermal throttling and its pretty bad even at 4 ghz its still thermal throttling even at stock speed it thermal throttles and at idle the temps around 40-60 idle I do a stress test using multiple programs intel xmu system stability etc and in less than 10 sec of stress test it thermal throttles to around 4.3 and I hear a strange noise coming from the cpu im not sure if this is a problem with the motherboard cpu or aio however I have changed the thermal paste and it hasnt made much difference please help, should I get a new motherboard? or aio? or cpu?

 

[deniselfmacario]

its really bad it really hits the thermal