RTX 3080 Ti runs to hot ?

I just bought a new PC with 3080 Ti Vision, I'm mining RVN while doing some office work and at night.

I know that the junction memory can be fixed by replacing pads, but I just bought the card I don't want to open it and risk voiding warranty just yet.

Junction memory is on 110C, and fan is always on 100%.

Should I be worried for my GPU health ?

BTW, when I lower my fan to 80%, the temp stays about the same, but hashrate drops about 20%, why is that ?

Thanks !