In this benchmark run with the well-known program a pretty obvious thing is noted. The scalability of the new 6core cpu based on new Sandy Bridge-E architecture did not allow a perfect performance scaling by the change from the 4 cores of 2600K to 6 cores.  Although the margin of increase from 2600K i7 CPU Intel is substantial. It is still worth noting that the CPU manufactured by AMD and current range can be very close when they are at the default frequency, while the gap increases when you compare them clock to clock to 4 GHz.