The SiS671DX, supporting Core 2 Due/Pentium® D/Pentium® 4 series processor with Hyper-Threading Technology and FSB up to 1066MHz, features a PCI Express x16 Bridge, flexible Single-Channel DDR2-667 Memory controller, and SiS MuTIOL® Technology, which connects with the SiS968 MuTIOL® Media I/O.

The PCI Express is a new standard of I/O interconnect. It has several advantages over legacy PCI. Furthermore, it is PCI compatible in software. The SiS671DX integrates a X16 Host-to-PCI Express bridge that is compliant with PCI Express SPEC 1.1. It also has lane reversal capability to provide maximum flexibility.

The Host interface can support the Core 2 Due/Pentium® D/Pentium® 4 series CPU with bandwidth up to 8.5GB/s. It also supports CPU with Hyper Threading Technology and FSB 1066MHz. The Sis671DX support Single Channel Memory Controller, providing bandwidth up to 5.3GB/s at DDR2-667.

SiS MuTIOL® technology is developed into three layers: the Multi-Threaded I/O Link Layer delivering 1.2GB/s bandwidth to connect embedded DMA Master devices and external PCI masters to interface with the Multi-Threaded I/O Link Layer, the Multi-Threaded I/O Link Encoder / Decoder in SiS968 to transfer data at 1GB/s bandwidth from / to the Multi-Threaded I/O Link Layer to / from the SiS671DX, and the Multi-Threaded I/O Link Encoder / Decoder in the SiS671DX to transfer data at 1GB/s from / to memory sub-system to / from the Multi-Threaded I/O Link Encoder / Decoder in SiS968.