The biggest problem with most peoples overclock attempts on this board is not setting the memory timing correctly. Unlike other providers such as Asus, when you set your memory timing to manual to adjust CAS, tRAS, tRCD, tRP, tRC, and Command Rate, you forget that there is also latency to be set, CAS to CAS Prewrite, Bank Error Time, and a whole slew of settings to adjust. If we had more ram that came with a JEDEC spec for 1333 and 1600mhz which already had these timings programed in them we would have alot less trouble with most people overclocking on the AMD platform in general. Most high performance DRAM has its advanced profile set as an XMP (Extreme Intel Profile) which our motherboards to not read, so they default to the pre-designed JEDEC spec.
You can see that my Kingston HyperX T-1 is a set with the Extreme Intel Profile for its designed speed of 2000mhz, and its JEDEC #4 is a pathetic 1333 with loose timing.
I would be willing to bet if more people took the time to read up on these settings, more people would have success overclocking.
Conversly on the higher end of the spectrum for benchmarking nothing beats pure speed.