Exactly. Which is why we shouldn't mislead people with confusing voltages ^^
On the GA-EX58 series you have a vdroop of around 0,03V, plus they usually undervolt. Setting 1,3000V in bios results in 1,248V load on my Extreme.
Now on the DFI (if the CPU-Z reading is even accurate), I get 1,31V loaded at 1,3000V bios setting when Vdroop is disabled. Quite the difference...