It's not bad and should be able to handle 4.4 ghz pretty well, but I would recommend an H100i instead if you plan on going 4.5+ ghz at any point.
Here's a quick chart on temperature comparisons. As you can tell, the H45 is smaller and would be around the ~H60 temps, if not hotter.
If size isn't an obstacle, the price jump to an H100 would be well worth it for more overclocking head room.
Here's the link (open the first tab under "i7 3770k"): (http://www.custompcguide.net/quick-comparison-between-corsair-h60-h75-h80-h90-h100-and-h110-liquid-cooling-series/)
Cheers mate, and good luck!