OK one more thing, in CPU banchmarks I can see DUAL E5520 reaching at score of 9,375. Now E5620 has just 4MB more cache but same QPI. Can u guess at what score DUAL E5620 will reach ? There are not enough benchmarks for 5600 series thats why i'm asking this ?
The difference between X5570 & X5670 is of 4000 score.http://www.cpubenchmark.net/multi_cpu.html