core clock is lowered in both cases but there is a diffenence.
a negative value represents an core clock offset. So if you fill in 400, it will lower you clock with 400Mhz
a positive value (above +500) represents an absolute core clock. So if you fill in 1060, the core is locked on 1060mhz… 1060mhz is also lower than nominal core speed.
.
The big difference between them
-
If you use the core offset and power is below the power limit, the card will raise the core speed to meet the power limit, so the card will be less efficient.
-
If you use the absolute core setting, core speed will be locked. resulting that the card use only the power that it needs. Which can give you a lower power consumption…and better efficiency.