I would choose a different board for overclocking. And do you need OC for speech recognition?
Take care also that the Gigabyte board (depending on the manufacture date/revision) might require a BIOS update before installing the FX 6100.
Apparently OC is not necessary but it can increase the responsiveness of speech recognition software. Usually, people recommend an i7 but I consider it as too expensive. The latest edition of the market leading speech recognition is quite resource intensive. In addition to raw processing power, is also requires a large L2- and L3-cache. Sufficient RAM is another important factor.