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The SIS645

Most know SIS as being the producer of value segment computer chipsets, and while that was true, a while ago; SIS today is moving into a more serious market with its latest solutions for the Pentium 4 and AMD Athlon processors.

The SIS 645 for the Pentium 4 is quite a unique solution with its support for DDR333 memory, which is capable of driving a bandwidth of up to 2666MB/s; higher than any DDR support available on today’s Intel and VIA chipsets.

The North Bridge offers support for SDRAM as well as DDR266 and DDR200; most boards featuring the SIS 645 will likely use DDR due its higher bandwidth over SDRAM.

The transfer protocol between the North and South Bridge is designed for multiple isochronous virtual channels, its 16-bit bus wide bus running at 266MHz provides a fully bi-directional channel that transfers data at up to 533MB/s. Features provided by the South Bridge include the practically the same you would expect from an Intel ICH2 or VIA South Bridge, including AC”97 v2.2 audio, Ethernet, dual channel USB, up to six USB 1.1 Ports and IDE Ultra ATA 100 support.

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