undervolting gpu

First time UV-ing here. the whole purpose of this UV is lowering power usage on the GPU. I just set my voltage to 1100mV and set the max clock speed from 2634MHz to 2454MHz (Factory Boost Clock Spec on MSI gaming trio X), I'm still figuring out what is best on the power slider here. right now...

I'm undervolting my GTX 1660 6gb GPU in the MSI Afterburner. I'm using Heaven Unigine for the stress test. I do know how undervolting works and all, but I have a question where I need your help... After running some tests I went for 862mV and 1830MHz. I was expecting to be able to do at least...