Difference in Performance: i5-2520M vs i5-2540M vs i7-2620M (Lenovo x220, MacbookPro)

V

vela.faltu

Disciple
I would like to find out the difference primarily between i5-2540M vs i7-2620M. My tasks will be primarily technical computations such as on tools like Matlab and heavy computational programming. Will the difference be substantial if I switch to the i7 processor? Kindly note that both processors are dual core processors.

The Macbook Pro 13" probably offers i5-2410M and i7-2620M. I am primarily interested in the X220 by Lenovo which offers i5-2410M, i5-2520M, i5-2540M and i7-2620M.
 
Re: Difference in Performance: i5-2520M vs i5-2540M vs i7-2620M (Lenovo x220, Macbook

Save money and get the 2520M or 2540M. ~5 % difference at the MAX between these and the i7. Not worth the upgrade at all. The difference will not be apparent.
 
Re: Difference in Performance: i5-2520M vs i5-2540M vs i7-2620M (Lenovo x220, Macbook

1) As per my crude calculations. If the processor cache is the same.

i7 = 2.7 * 10^9 operations per sec

i5_2.3 = 2.3 * 10^9 operations per sec

i5_2.6 = 2.6 * 10^9 operations per sec

i7 to i5_2.3 difference in performance = 17% roughly

i7 to i5_2.6 difference in performance = 3.8% roughly

2) If the frequency is the same and cache is different.

i7 = 4 MB

i5 = 3 MB

i7 to i5 percent improvement = 33% (roughly) [Please correct me if I am wrong]

3) Taking both cache and frequency into account. If I simply add the two although I am sure that would be incorrect.

i7 to i5_2.3 = 50% improvement

i7 to i5_2.6 = 33% improvement roughly

i5_2.6 to i5_2.3 = 13% improvement roughly
 
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