Ghrugen

That makes perfect sense @DevBiker have swtiched it on and got a fan speed in Link. Not much change in the temp for the CPU but there was under load. Hopefully yourself and @LeDoyen have solved it. I will give it a litle while and see how it goes. Thank you both very much.

I don't know. I have them connected to the CPU_FAN but when its lower temp it says 0 RPM even if I have it at 100%. It does show a number if I put it under load with not much difference to the pump temp

I am not running an overclock. Everything is on Auto in the bios. I did update the bios not so long ago so maybe something has gone funny I will have a dig around.

I got the H80i V2 in September 2017, replaced motherboard, CPU and PSU last September 2020. Everything has been working fine until a couple of weeks ago when my CPU temps starting getting very high, regulary hitting 70c under half load but the temp on the cooler didn't go over 35c. We have been having a heatwave here and the CPU had been under heavy load, so I thought it could just be that at first but I took the machine apart, remounted the cooler, new thermal paste and nothing has changed at all. I am pretty sure that the cooler is tight to the CPU and corsair link says it is pumping away. The temp will come straight down after going high and settle in the mid 40s. I am worried that my pump is gone or there is a lack of water. Any ideas on what to do? Under no load Using powerMAX for full load, Temp 2 gets 90c and the pump temp has barely risen.