Intel dual-core processor

At present, Intel's dual-core processors include the Pentium D and Pentium Extreme Edition. At the same time, the 945/955 chipset is introduced to support the newly-launched dual-core processors. The two new dual-core processors used in the 90-nm process are used. There is no LGA 775 connector on the pins, but the number of chip capacitors on the bottom of the processor is increased and the arrangement is different.

The processor of the desktop platform's core code, Smithfield, was officially named the Pentium D processor. In addition to getting rid of Arabic numbers and using English letters to represent the generational alternation of this dual-core processor, the letter D is more reminiscent of Dual- Core dual-core meaning.

Intel's dual-core architecture is more like a dual-CPU platform, and Pentium D processors continue to use the Prescott architecture and 90nm production technology. The Pentium D core actually consists of two independent 2 independent Prescott cores, each with independent 1MB L2 cache and execution units. The two cores add up to a total of 2MB, but since both cores in the processor have Separate caches, so you must ensure that the information in each L2 cache is exactly the same; otherwise, there will be operational errors.

In order to solve this problem, Intel handed over the coordination between the two cores to the external MCH (Northbridge) chip. Although the data transfer and storage between the caches is not huge, it needs to be coordinated through an external MCH chip. Processing, there is no doubt that the entire processing speed will bring a certain delay, thus affecting the overall performance of the processor.

Due to the Prescott kernel, Pentium D also supports EM64T technology and XD bit security technology. It is worth mentioning that the Pentium D processor will not support Hyper-Threading technology. The reason is obvious: It is not easy to correctly distribute data flow and balance computing tasks among multiple physical processors and multiple logical processors. For example, if the application requires two computing threads, it is obvious that each thread corresponds to a physical core, but if there are 3 computing threads? Therefore, in order to reduce the complexity of the dual-core Pentium D architecture, Intel decided to cancel support for Hyper-Threading technology in the Pentium D for the mainstream market.

With Intel's hands, and the difference in the name of the two dual-core processors Pentium D and Pentium Extreme Edition also indicates that these two processors are not the same in the specifications. The biggest difference between them is the support for Hyper-Threading technology. Pentium D does not support Hyper-Threading Technology, and Pentium Extreme Edition does not have this limitation. With the Hyper-Threading Technology turned on, the dual-core Pentium Extreme Edition processor can simulate two other logical processors that can be considered by the system as four-core systems.

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