Why don't you do yourself a favour, and get your self a $190 AMD FX-8150? For video encoding and conversion, it will easily tie with the i5.
Video conversion one of the strongest points of the FX chips, because such software can use all of the chips 8 cores
You might as well wait for the newer FX-8350 chips that are coming out by the end of October, they offer around 15% better performance in video encoding verses the current FX 8150.
The i5 has quick sync, but the quality is bad when compared to pure x86 encodings