Unfortunately that CPU is "Conroe" microarchitecture, but the
latest BIOS updates for the MOBO mention only Cedar Mill/Presler and 805 CPU (Pentium D) which belong to the
previous "NetBurst" generation.
So even if you'd update your MOBO to the latest available BIOS, there is nothing to corroborate the belief that the e4700 could be even unofficially supported.