I'd like to know myself. I believe the v3.1.4.0 adds the TLB workaround for the quad core CPUs. Not worth it IMHO for the 10-20% performance hit. I am more interested in the changes between v3.1.1.0 and v3.1.3.1 as I've seen issues on the dual core CPUs with the microcode updates enabled from the AGESA v3.1.1.0