Save the pixels

+1 stop

-1 stop

Well exposed (+1 stop)

1:1

Under Exposed (+/- 0)

1:1

There is less noise when the exposure is higher.

Jpeg

Raw

Theres actually less noise in the jpeg than in the raw file. I suppose there is a noise reduction process in the jpeg compression in the camera. The jpeg clearly contains less details and is less sharpthan the raw file.