History
Historically, there are three platforms for the Intel P6-CPUs: Socket 8, Slot 1 and Socket 370.
Slot 1 is a successor to Socket 8. While the Socket 8 CPUs (Pentium Pro) directly had the L2-cache embedded into the CPU, it is located (outside of the core) on a circuit board shared with the core itself. The exception is later Slot 1 CPUs with the Coppermine core which have the L2-Cache embedded into the die.
In the beginning of 2000, while the Pentium-III-CPUs with FC-PGA-housing appeared, Slot 1 was slowly succeeded by Socket 370, after Intel had already offered Socket 370 and Slot 1 at the same time since the beginning of 1999. Socket 370 was initially made for the low-cost Celeron processors, while Slot 1 was thought of as a platform for the expensive Pentium II and early Pentium III models. Cache and core were both embedded into the die.
Slot 1 also obsoleted the old Socket 7, at least regarding Intel, as the standard platform for the home-user. After abandoning the Intel P5 Pentium MMX CPU, Intel completely left the Socket 7 market to the manufacturers AMD, Cyrix and IDT.
Read more about this topic: Slot 1
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