CPU/Mobo how exact is Windows 7 rating for processors ?

hari1

Disciple
I'm really confused about this.As the ratings for 2nd gen i3 2120, i5 2500k and 3rd gen i5 3570k have same performance rating of 7.6 out of 7.9...(source : google and youtube )

Here are the price and their rating for different processor..

sandy bridge i3 2120 -7.6 (6.5k) Intel Core i3-2120 3.3GHz Sandy Bridge Processor Review - CPU-Z, GPU-Z and Windows Index Score - Legit Reviews
sandy bridge i5 2400 -7.4 (over 10k not sure)
sandy bridge i5 2500k -7.6 (over 12k) Intel Core i5-2500K Vs Core i5-2400 | Compare Processors
ivy bridge i5 3550k - 7.4 (over 13k)
ivy bridge i5 3570k - 7.6 (15k)

I'm not sure about the prices,please mention it.

Could u guys explain the difference between these processors ?

So the i3 2120 is equivalent to i5 3570k and i5 2500k..then whats the point of putting so much money on succesors..

Is the only difference is inbuilt graphics which is better in ivy than sandy..? What if we add GPU for all ? Will the i3 2120 gives the same performance when compared to i5 2500k and i5 3570k ?
 
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