intel core i3 vs i5 vs i7

Intel Core i3 vs Core i5 vs Core i7 Comparison- The Difference
This post explains the difference between the Intel Core i3, Core i5 and the Core i7 processors.
Intel Core i3
Codenamed: Clarkdale (Westmere)
Fabrication: 32 nm
Instruction set: X86, X86-64, MMX, SSE 4.2
Socket: LGA 1156
Bus: Direct Media Interface
RAM: DDR3
Chipset Support: P55, H55, H57, Q57
Intel Core i5
Codenamed: Lynnfield (Nehalem), Clarkdale (Westmere)
Fabrication: 45 nm, 32 nm
Instruction set: X86, X86-64, MMX, SSE 4.2
Socket: LGA 1156
Bus: Direct Media Interface
RAM: DDR3
Chipset Support: P55, H55, H57, Q57
Intel Core i7
Codenamed: Bloomfield (Nehalem)
Fabrication: 45 nm
Instruction set: X86, X86-64, MMX, SSE 4.2
Socket: LGA 1366
Bus: Quick Path Interconnect
RAM: DDR3
Chipset Support: X58

Intel has classified the Core processor range into Core i3, Core i5 and Core i7. Both the cost and the performance goes on increasing as you move from Core i3 to Core i7.