Hey there,
Undervolting without underclocking will lead to instabilities.
You may be able to do it a little bit, it's generally recommended though to underclock too.
In general for overclocking/underclocking you have 3 options.
1. Manual Core Voltage + Sync All Cores All cores will be synced to your preffered ratio (
lower ratio for underclock).
All cores will run at your fixed/static core voltage. (
lower voltage for undervolt)
Example: All-Core 42x @ 1.15v (
static voltage)
2. Auto Core Voltage + Sync All CoresAll cores will be synced to your preffered ratio (
lower ratio for underclock).
All cores will run on a automatically controlled voltage. (
lower voltage for undervolt)
Example: All-Core 42x @ 0.60 - 1.15v (
dynamic voltage)
3. Auto Core Voltage + By Core UsageAll cores will be synced to the ratio specified by the core-usage, chosen by you. (
lower ratio for underclock).
That means that the ratios will change basen on how many core are used.
All cores will run on a automatically controlled voltage. (l
ower voltage for undervolt)
Example: 45x-45x-44x-44x-43x-43x-42x-42x @ 0.60 - 1.15v (
dynamic voltage)
** (values and voltages are just an example, they are not valid) **When Auto Core Voltage is chosen, you can also use the V/F Curve to further offset the automatic voltage using Point Offsets.
My exaplanation is not the best, you may want to check this amazing video below, and use it as a reference for underclocking / undervolting instead of overclocking.
Video:
https://www.youtube.com/watch?v=uNVPBH0bgQU