Well his Core is the one that's really overclocking higher than usual. His memory at 412 is right on the money as far as averages are concerned.
Seems like most everyone tops out around 400-420 on the memory. Few have gone over 440.
Say the additional quad(s) are opened, memory speed will have an even greater impact on performance, as it will be the limiting factor. Yes, benchmarks will go up - but someone with memory at 450MHz will have a nice lead over someone with memory at 400Mhz.