Looking at power numbers they line up at stock with the other Z77 offerings. If anything the BIOSTAR sits a little lower, which is nice. Overclocked, though, we of course see the numbers increase in both idle and load, but there not at a level we'd be worried about.
At stock our numbers aren't bad with the idle number looking really good and the load sitting between the other Z77 offerings.
Overclocked, though, we see the load number skyrocket to a massive 99c. When we were testing at 4.8GHz, we saw our CPU hit over 105c and that was causing the CPU to slow down. Unfortunately these 90c+ numbers aren't all that uncommon on latest Z77 platform with the current crop of Ivy Bridge processors.