Different between Dual Core, Core 2 Duo and Quad Core

Dual Core	Core 2 Duo	Quad Core
Dual core processors are those that contain 2 cores in a single silicon chip	Core 2 Duo is the name given by Intel to its second batch of dual core processors.	4 processors in a single chip are called quad core
L2 Cache 2 MB	L2 Cache 2 MB	L2 Cache 8 MB
No Virtualization Technology (VT-x)	No Virtualization Technology (VT-x)	Supports Virtualization Technology (increase management efficiency, strengthen security, while making your computing infrastructure more resilient in the event of a disaster)
Supports Execute Disable Bit	Supports Execute Disable Bit	Supports Execute Disable Bit is a hardware-based security feature that can reduce exposure to viruses and malicious-code attacks and prevent harmful software from executing and propagating on the server or network.
Sockets Supported LGA775	Sockets Supported LGA775	Sockets Supported LGA775
Clock Speed 1.86 GHz	Clock Speed 2.4 GHz	Clock Speed 2.5 GHz
Thread support is 2	Thread support is 2	Thread support is 4

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