what is differnce between "dual core" and " core 2 duo" processors?

Answer 1

A dual core processor is a CPU with two separate cores on the same die, each with its own cache. It's the equivalent of getting two microprocessors in one.
Dual core technology refers to two individual microprocessors on a single die cast chip. This is essentially two computer processing units (CPUs) in one. The advantage of a dual core chip is that tasks can be carried out in parallel streams, decreasing processing time. This is referred to as thread-level parallelism (TLP).
TLP is also possible on motherboards that can accommodate two separate CPU dies. When TLP is accomplished in a single CPU through dual core technology, it is called chip-level multiprocessing (CLM).
In dual core CPUs, each microprocessor generally has its own on-board cache, known as Level 1 (L1) cache. L1 cache significantly improves system performance, because it is much faster to access on-chip cache than to use random access memory (RAM). L1 cache is accessed at microprocessor speeds.
The Intel® Core™2 Duo desktop processor delivers revolutionary dual-core performance and breakthrough processor energy efficiency.
Based on the revolutionary Intel® Core™ Microarchitecture, the Intel Core 2 Duo processor has been developed for an increasingly multimedia-centered, high-definition world, and is designed to do more in less time.
Intel Core 2 Duo processors operate at lower frequencies while producing higher performance compared to today’s higher frequency processors, thus enabling quieter and smaller desktop PCs

Answer 2

The architecture, processing speeds every thing is different.

The first thing you need to know about Core 2 Duo is that it's not hugely different to the Core Duo. The key difference is that the fastest chips in the range, the T7xxx series, use 4MB of level 2 cache instead of the standard 2MB. The entry-level chips use 2MB, but all Core 2 Duo CPUs have the benefit of 64-bit EM64T support -- though we won't see the full benefit of this until Windows Vista rolls around.

This page gives you a clear idea of performance difference
http://www.barefeats.com/mbcd6.html

Answer 3

Dual core processors are simply processors that have two cores (like having two processors).

Core 2 Duo is a brand of processor from Intel, like the Pentium line of processors. Its simply Intel's name for their current line of dual core processors. (Core is the brand line, 2 means its the second line of the Core line, and Duo means its a dual core processor)

Answer 4

dual core - describes that there are two microprocessor cores in one chip.

Core 2 Duo is the brand name of the new Intel processors.

So the "Core 2 Duo" is a "dual core" processor.
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ANALOGY would be: "2-ply paper towel" and "Bounty"

"2-ply paper towel" - describes there are two sheets of material for every square of paper towel.

"Bounty" is a brand of 2-ply paper towels.

So: A roll of "Bounty" is a roll of "2 ply paper towels"