(Depending on when you last upgraded, that is.) increases the transfer speed of data from one piece of hardware to another.For example, SATA III has a maximum rated speed of 6 Gbps and USB 3.0 tops out at 5 Gbps.
If speed is the sole reason for the upgrade, rethink where you’re spending your money.
All of the above reasons are good, but in my opinion, this is the single greatest reason to upgrade your motherboard.
If any of these items are on their last leg, incompatible, or lagging behind in performance, your entire machine can slow to a crawl with or without the new CPU/motherboard combo.
The whole BIOS updating procedure should be treated with extreme caution.
If you have a first generation Core i5 or Core i7, however, you’re going to notice massive gains jumping to a newer Skylake processor.