This page is where you create your default rig overclock settings. Changes you make here, will be applied as your default overclock settings when you add a new rig to your farm. Since AMD and NVIDIA have different overclock settings there are 2 sections. Core values will effect on electricity and memory value will effect the GPU hashrate. You can also set auto fan speed settings from here.
The logic between AMD and NVIDIA overclocking is different. On AMD, values that you enter for core clock and memory clock will be set as your GPUs MHZ. So if you leave the core and memory boxes blank, GPUs will get the default MHZ values. We suggest that you give between 1100/1250 to core clock, and between 2000/2150 to memory clock in AMD GPUs.
NVIDIA overclocking on the other hand works differently. The values that you enter for core and memory clock will be added on your GPUs default core and memory MHZ. We suggest that you give between -250/+250 to core clock, and between 1000/2000 to memory clock in NVIDIA GPUs.