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Hey there I have had my H100 running in high performance mode for over a year now.

I just swapped cases and every 1 second on and off I hear a grinding/groaning type of sound coming from it.

Does anyone know what might cause this?

I changed from stock H100 fans to the Corsair SP120 quiet ed too.

Its not coming from the pump. It sounds like its coming from the res sometimes and others from the other side of the rad.