unfortuantly not posible due to different sockets core 2 duo uses a LGA 775 socket where as an i5 uses a LGA 1156 socket
here is an article about the 2 processors
The Intel Core i5 series is based on two architectures:
1. Westmere (Core i5 6xx – Clarkdale – 32 nm – Dual Core)
2. Nehalem (Core i5 7xx – Lynnfield – 45 nm – Quad core)
Intel Core 2 Duo
Codenamed: Conroe, Allendale, Wolfdale – Core 2
Fabrication: 65 nm / 45 nm
Instruction set: X86, X86-64, MMX, SSE 4.1
Socket: LGA 775
Bus: 1333 MHz FSB
RAM: DDR2
Chipset Support: 965, P3x, G3x, P45, X48
Intel Core i5
Codenamed: Lynnfield, Clarkdale
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
LGA 1156, Direct Media Interface, Smart Cache
Like the Intel Core i3 processors, The Core i5 are also native dual cores; they have both processors on the same die which leads to better processing speeds. The quadcore Core i5 processors are native Quad cores – 4 processors on the same die – much faster than two dual cores stitched together. While the Intel Core 2 Duo processors work on the LGA 775 socket, the new Core i3 and Core i5 processors use the LGA 1156 socket and support motherboards based on the following chipsets - P55, H55, H57, Q57.
All the Core i5 processors sport the DMI (Direct Media Interface) which is much faster than the FSB used in Core 2 Duo processors but is not as fast as Quick Path Interconnect in the Core i7. They also have a on die memory controller which helps in much faster memory access than the Core 2 Duo processors. They also support Smart Cache which allows cache memory sharing between the two cores reducing memory latencies.
sorce is
http://www.pathikshah.com/blog/intel-co ... ifference/
regards
phill