SiSoftware Sandra
Sandra's CPU Benchmarks are only CPU dependant, so it is normal that both boards perform the same here. Small differences are caused by minor inaccuracies in execution time measurement.
Lavalys Everest
DFI has been releasing many BIOSes, which are always optimizing memory performance a little bit more. As you can see the time spent was worth it.
It seems DFI has also optimized the memory latencies of the integrated memory controller on the Athlon64.