How to Overclock Nvidia 1660, 6GB on T-Rex Miner and 2Miners Pool?

Hello,

I have 12 Nvidia GTX 1660 Super 6GB GDDR6 192-bit on a open frame rig, TRex Linux with Kawpow and 2Miners pool for raven coin.

My hash rate is 190.89 MH/S.

How do I overclock my GPUs?

and

Will it help increase hash rate and earnings?

https://preview.redd.it/z3t3rub3ayg71.png?width=986&format=png&auto=webp&s=acee7a2e96d598bcd2022de820ec8efca1f683cd