The Cooler Master Hyper 212 EVO doesn't benefit from a 2nd fan. It is very compact and efficient with just 1 fan...also quieter.
It is also a very good budget cooler. From personal experience, I had my FX 8350 at 4.4GHz on stock voltage under the 212 EVO. It stayed below 56-57c at full load. This was with 1 fan. So you will be fine.