DIFFERENCE BETWEEN CORE I3, CORE I5

-> Core i3:
* Entry level processor.
* 2-4 Cores * 4 Threads
* Hyper-Threading (efficient use of processor
resources)
* 3-4 MB Cache
* 32 nm Silicon (less heat and
energy)

-> Core i5: 
* Mid range processor.
* 2-4 Cores
* 4 Threads
* Turbo Mode (turn off core if
not used)
* Hyper-Threading (efficient use of processor
resources)
* 3-8 MB Cache
* 32-45 nm Silicon (less heat
and energy)

-> Core i7: 
* High end processor.
* 4 Cores
* 8 Threads
* Turbo Mode (turn off core if
not used)
* Hyper-Threading (efficient use of processor
resources)
* 4-8 MB Cache
* 32-45 nm Silicon (less heat
and energy)