DO NOT ever update a bios unless it will fix a problem you have.
A failed bios update can brick your motherboard.
If your motherboard is new stock, it will have the latest bios, or close to it.
Considering that the 4670K has been out for some time, I would not worry.
To be certain, go to the msi web site and look for your motherboard. There should be a cpu support list, and the bios levels necessary for each cpu. On the bios download list, there will be a date that the bios was released.