Multi-core means any number of cores greater than one.
Dual-core is a multi-core with exactly two cores.
No
Dual core is two cores on one chip. core 2 duo is two separate chips. Dual core is slower because they have to share the same input output stream.
There is no difference between dual core and core 2 duo. Intel just name its recent family of dual core processors as "core 2 duo". Both (core 2 duo and dual core) works in same fashion.
No. A Pentium Dual Core is a cost-reduced version of a Core 2 Duo. Think of it as the new equivalent of a Celeron. The Pentium D is basically a dual-cored version of the Pentium 4, but is far less efficient than a Core 2 Duo (or a Pentium Dual Core).
They are approximately the same at the same frequency.
When you have more than one core in your CPU, you have a multi core CPU. No matter how many cores are in your CPU, everyone of them is working at the same frequency. It is very important to know that when you have a dual core CPU for example and there are two cores wowking at 2Ghz each, your CPU is NOT 4Ghz it is still 2Ghz.
yes
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.
Dual core?
A multi-core processor is one which combines what are essentially multiple CPUs into a single chip. As far as the operating system and other software are concerned, it is the same as a dual or quad-cpu computer system, even though the cpus are physically one single unit.
A dual core processor has two (mostly) independent CPU's. The operating system can assign them (this is called dispatching them) to two different threads at the same time. Theoretically, you could get twice as much done in the same period of time, but this depends on other things, such as cache hit/miss ratio, memory latency, and (the biggest part) whether or not the software is designed to run multi-threaded. It is also worth noting that most threads do not run all of the time - they start and stop, and they wait for other things - so dual core capability will not have that much of an impact in many cases.
The quad core is better. As its 4 cores, the workload is spread efficiently between them so it runs smoother. But the quad core is more expensive.The Intel Core 2 Duo processor was designed to meet the demand for increased performance from PC users. It can run multiple, intense software applications simultaneously.