Strange GPU Noise

Hello, so I have a problem I’ve had my new pc now about 6 months, not had a problem Until now. It was pre built as I don’t know much about pc’s I’m not very technical. But recently especially when loading up games my gpu seems to be making a really high pitch noise. It’s loud as a game starts up...

I have a helios 300 g3-572 model, which under warranty the cooling fans were replaced. The fans doesnot reach the full rpm even after the replacement. Please help me with some solution or a link to purchase a new set of hea sink and fans