Socket 478b is a CPU socket from Intel Corporation with 478 pin contacts, mainly released in 2007 for some laptop PC chips under the Core 2 brand. It is not compatible with AMD sockets. The socket supports various CPUs, including Pentium Dual-Core and Celeron M, and uses the PGA form factor with FCPGA variant. It supports data transfer rates of up to 1.066 MT/s.
Named after the number of pin contacts, socket 478b is a central processing unit (CPU) socket from semiconductor manufacturer Intel Corporation. It was mainly released in 2007 for some of the laptop personal computer (PC) chips under the Core 2 brand; the component is also called Socket P. The suffix b is intended to distinguish it from the 478-pin contact version of Intel Advanced Micro Devices’ (AMD) main competitor, which is called Socket 478, or Socket N, and was released seven years ago . Despite their similarities, Intel and AMD sockets are not compatible with each other.
The main division of Socket 478b-compatible CPUs, Intel Core 2, was the successor to the Pentium brand in 2006, then in its fourth iteration with the Pentium 4 as the company’s flagship brand. The Socket 2b compatible Core 478 chips were divided into two categories. They consisted of the dual-core or dual-processor unit, 2 Duo series T5xx0, T6xx0, T7xx0, T8x00, T9xx0; and the quad-core series, 2 Quad Q9x00.
Intel, however, also made Socket 478b compatible with the Pentium Dual-Core, which also appeared in 2006 and became the company’s mid-range brand. More specifically, it housed the T2410 and the T23x0, T3x00 and T4x00 series. The third brand that was granted compatibility was the Celeron M, which is Intel’s entry-level brand’s version of the laptop chip. Some members of the Core 2 Duo T5xx0 and T7xx0 series use Intel’s Socket 479 or Socket M instead, although it is not compatible with Socket 478b due to a contact mismatch.
Socket 478b contacts are holes for connecting the processor to the motherboard, the PC component with most of its crucial connectors and features, for conducting data transfers. The socket also acts as a protective device for the CPU, preventing potential damage to the CPU, particularly during insertion and removal. Socket 478b uses the pin grid array (PGA) form factor, which involves the arrangement of pin holes in an ordered, grid-like four-row format on its square-shaped substrate. A square section is cut from the center of the Socket 478b.
The PGA variant used by Socket 478b, flip-chip PGA (FCPGA), means that the CPU is flipped on its side to expose the back of the die, which is its hottest part. This allows the user to place a heat sink over it to reduce heat and thus prevent the chip from malfunctioning. Celeron M processors use the Micro FCPGA variant, which is the smallest version of PGA. Socket 478b supports data transfer rates of 400, 533, 667, 800, and 1.066 million transfers per second (MT/s).
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