Well simply what you do is see how many times 5 goes into 3 and if you think 5+5+5=15 which is 3 groups of 5.
what is i5
Intel core i5 is used in desktops and laptops while mobile i5 is used in netbooks, the mobile i5 is not as powerful as the regular i5 because it is built for mobile devices.
intel i5 generally however some amd's will be better than i5's and vice versa
How install Microsoft windows- xp in core i5
1/(4+i5) = (4-i5)/(16+25) = (4/41)-i(5/41)
Core I5 480m is significantly faster the i5 480m can turbo-boost to 2.93 whereas the 370m is stuck at 2.4
the difference between i5-6xx (Dual Core) and the i5-7xx (Quad Core) is that the Dual Cores have a integrated GPU clocked at about 733MHz, however the Quad Cores are extremely fast and the i5-760 can even outrun some of the i7s! also the dual cores have half the L3 Cache as the Quads. Unless u really do not want to buy a GPU i would go for a i5 Quad as the i5-750 is only £8 more expensive than the cheapest Dual.
Core2Duo is a dual-core processor (two processors), as the i5 is a quad-core processor (four processors). So the i5 is, significantly.
In terms of performance, The Intel Core i5 out-performs the Intel Core 2 Duo. So if you have the money, go for the i5.
Intel Core i5 i5-7xx, Core i7 i7-8xx, Xeon L34xx, Xeon X34xx, Celeron G1xxx, Pentium G6xxx, Core i3 i3-5xx, and Core i5 i5-6xx. The 'x' represents any number.
if you are a average user than i3 will be considerable and price is also affordable but if you want a processor which can do multitasking and give you a higer and faster performance than i5 is best
ebay