The Core i5 is a Lynnfield processor, which is itself based on the Nehalem Intel Core microarchitecture. It features an integrated memory controller supporting 2-channel DDR3, hyperthreading technology (which means that four cores translates into processing capacity for eight threads), features 8MB of Intel Smart Cache, and supports Turbo Boost technology and an integrated PCI-Express graphics controller. The socket for this chip differs from the LGA1366 used by the Core i7 (Bloomfield). (source: news.cnet.com)
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