Details of SiS' official Pentium 4 chipset - as opposed to VIA's unofficial one, see VIA Pentium 4 chipset ships to mobo makers - have emerged on the Web over at Overclockers Workbench.

SiS' chipset, the SiS 645, comprises a Northbridge part of the same name and a Southbridge called the SiS 961. Connecting the two is a 533MBps bus.

The Northbridge supports PC333 and PC266 DDR memory and PC133 SDRAM - up to 3GB of it. It connects to the P4 over a 400MHz frontside bus. Oh, and it supports an AGP 4x bus too.

The Suthbridge supports pretty much what you'd expect: ACR and CNR slots, AC97 compatible audio, Dolby 5.1 audio output, ACPI 1.1, APM 1.2, two USB controllers supporting up to six USB connectors, ATA100/66/33 dual-IDE channels and supports for up to six PCI slots. It also supprts 100Mbps Ethernet and HomePNA.

That leaves it less interesting than Acer Labs' official P4 chipset, which is said to have Sony Memory Stick and USB 2.0 support too. It also supports AGP 8x. ®

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Related Link

OC Workbench: SiS P4 DDR chipset details