At stock the power draw on the ASRock offering is higher than the ASUS board. We're sitting at numbers similar to the Z77 platform. The same can be seen at load with the numbers being roughly 15% higher than the ASUS option.
Overclocking doesn't change the idle draw, but you can see, we've got a 15% increase in load.
Looking at the heat numbers you can see at stock we're actually running slightly lower than the ASUS when it comes to load. As for idle, you can see all three Z87 results are very similar, which is a little up on the Z77 platforms numbers.
Overclocked, though, we really see that number sky rocket to almost 100c. We're hoping like the Z77 platform, we see this number drop as we hit another batch of processors.