Hi, I have just done the upgrade from iMac 27 2019, i5 8500k to i9 9900kf. [br]
You must be very careful changing the cpu, it’s easy to damage the pins under the cpu. Puting back the cooler is the hardest part of the surgery. Also no heat problem or full speed running fan. Everything’s running smooth for now. [br]
I also install Samsung 980 pro with the hope that it runs at full speed, but there is no benefit at all. Because it’s not running at full speed. You don’t get more than 3000 write and read speed because of Pcie 3.0 x4. [br]
So I put back my Samsung 970 evo and happy with it for now.