SECC

SECC. The Single Edge Contact Cartridge (SECC) was a processor packaging form factor and module standard introduced by Intel in the late 1990s. It marked a significant departure from traditional Pin Grid Array sockets, housing the central processing unit, L2 cache, and a heatsink within a protective plastic cartridge. This design was primarily developed for Intel's high-performance Pentium II and early Xeon processors, facilitating easier handling and improved thermal management for the consumer and server markets.

Definition and Overview

The SECC format was conceived as an integrated module, radically different from the bare die or ceramic packages common in earlier microprocessor designs. The cartridge enclosed the processor die mounted on a substrate, along with discrete static random-access memory chips for the secondary cache, all covered by a metal thermal plate and a black plastic shell. This approach was partly a response to manufacturing challenges and competitive pressures from rivals like Advanced Micro Devices and Cyrix. The design interfaced with the motherboard via a 242-pin edge connector, slotting into a retention mechanism known as Slot 1 for desktop platforms or the larger Slot 2 for workstation and server systems.

Technical Specifications

The cartridge's physical dimensions were substantial, typically measuring about 5.5 inches in length. Electrically, it maintained a front-side bus interface that operated at speeds of 66, 100, or 133 MHz, depending on the specific processor model. A key technical aspect was the integration of the L2 cache, which for most Pentium II variants ran at half the core frequency of the CPU and was connected via a dedicated back-side bus. The cartridge incorporated a serial EEPROM known as the Processor Information ROM, which stored critical identification data for the system BIOS. Thermal management was achieved through an attached heatsink, with cooling often supplemented by an active fan.

Applications and Usage

The primary application of the SECC was in mainstream desktop computers powered by the Pentium II processor, which became a common sight in systems from major original equipment manufacturers like Dell, Compaq, and Hewlett-Packard. In the professional sphere, the cartridge was adapted for the first-generation Xeon processors, targeting servers and high-end workstations used for tasks such as computer-aided design and scientific computing. The design also found a niche in the enthusiast market, where its distinct appearance and overclocking potential were notable. Furthermore, the form factor was utilized in some versions of the Celeron processor, though these later transitioned to a cheaper, cacheless variant known as the Single Edge Processor Package.

Variants and Related Standards

The original SECC was soon followed by the SECC2, a revised version that removed the metal thermal plate and featured a more open design for improved cooling efficiency. This variant was used for later Pentium II and most Pentium III processors on Slot 1. The related Single Edge Contact Cartridge (SECC) designation is sometimes used interchangeably, though it specifically refers to the cartridge's connector system. For the high-end market, the larger Slot 2 interface used a modified cartridge for the Xeon line. Competing architectures from AMD, namely the Slot A format for the Athlon processor, employed a physically similar but electrically incompatible cartridge design.

Historical Context and Development

The development of the SECC emerged during a period of intense competition in the x86 microprocessor industry, often referred to as the processor wars. Intel's previous flagship, the Pentium Pro, used a costly multi-chip package that hampered yields and market competitiveness. The SECC solution, developed alongside the new P6 microarchitecture, allowed for more flexible manufacturing and separated the cache from the CPU die to improve production economics. Its introduction coincided with major industry events like the launch of Microsoft's Windows 98 operating system. The cartridge format was relatively short-lived, however, as advancements in semiconductor fabrication enabled the re-integration of full-speed L2 cache on-die, leading to the revival of the socketed format with the Socket 370 for the Pentium III and Celeron, rendering the SECC obsolete by the early 2000s. Category:Computer hardware Category:Central processing unit Category:Intel microprocessors Category:Computer standards