Hi,
There could be a BIOS related issue with using the i5-3470 processor which would need the BIOS to be updated first, as you have read. The thing to do is check the CPU support list for the motherboard that you are thinking of getting to see which BIOS version is required to support the processor.
If you are buying the motherboard from a reputable dealer you can always ask them to flash the BIOS to the latest version for you, before they ship the board, to make sure it is up-to-date. They may make a small charge for doing this but it can save a lot of grief when it comes to putting the system together.