The Intel Core 2 Extreme is a mobile processor for items like laptops, netbooks, and smart phones. It is a high performance processor that is featured in many products.
´Dual core' just means that there are 2 separate cores in the CPU. Intel has made dual core pentuim 4, core duo and core 2 duo CPUs. ´Core 2 Duo´ is just one type of dual core CPU that Intel has made.
The socket type that is required for the Intel Core i7 9xx desktop series is the LGA1366 socket.
The Intel Core 2 Duo E8500 Dual-Core Processor fits in an motherboard with a socket type of LGA 775. If you are purchasing a motherboard for this type of CPU, make sure you purchase a CPU that clearly indicates that it is for Intel processors with a socket type of LGA 775.
The question you're asking, unfortunately, is not worded correctly. An Intel processor is a family of processor, where a quad-core processor is a type of processor. The Intel family includes many types of quad-core processors. However, to try and disambiguate what you're asking, an Intel core processor will be good, no matter what type it is. An Intel quad-core processor - for example, the Intel i7 - will perform fantastically well. The other main type of processor manufacturer - AMD - also have quad-core processors. However, a lot of it is down to opinion and machine build as to whether Intel is better than AMD, but personally, I believe Intel will out-perform and out-last an AMD processor.
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The Intel Core 2 Duo uses 400, 533 or 800 Mhz bus speeds, depending on the type.
This depends on what type of A-Series you are talking about, but the i3 is better than the Pentium Dual Core although they are based on the same microarchitecture.
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The E6600 uses LGA775.
No. Core 2 is on a different socket type. The i3 will not fit into the core 2 socket, and vice versa.
The software must be designed for that type of technology. This can be determined by looking on the product package for the Intel MMX, Intel SSE, Intel SSE2, Intel SSE3 or AMD 3DNow!, HyperTransport!, or PowerNow! symbols.