The SiS746FX features an AGP 8X bridge, and a DDR400 Memory controller, supporting AMD Athlon S2K FSB up to 333 MHz. The SiS746FX, via the second-generation 1GB/s Multi-threaded I/O link, interconnects the SiS963L Media I/O that integrates one EHCI compliant USB 2.0 host controller, 2 OHCI compliant USB 1.1 host controllers, the ATA-133 dual IDE controller, AC'97 V2.2 compliant audio controller, and the Ethernet MAC controller with standard MII interfaced.

The SiS746FX DDR400 memory controller delivering 3.2G/B bandwidth way adequate and satisfactory to the 333MHz S2K FSB bandwidth demand of 2.7 GB/s, absolutely brings out the best performance of each other, and still has a lot to spare for the multi-I/O masters, and AGP 8X masters.

The AGP interface can support external AGP slot with AGP 4X/8X capability and Fast Write Transactions. A high bandwidth and mature SiS MuTIOL® 1G technology is incorporated to connect SiS746FX and SiS963L MuTIOL® 1G Media I/O together. SiS MuTIOL® 1G technology is developed into three layers, the Multi-threaded I/O Link Layer delivering 1.2GB bandwidth to connect embedded DMA Master devices and external PCI masters to interface to Multi-threaded I/O Link layer, the Multi-threaded I/O Packet Layer in SiS963L to transfer data w/ 1GB/s bandwidth from/to Multi-threaded I/O Link layer to/from SiS746FX, and the Multi-threaded I/O Packet Layer in SiS746FX to transfer data w/ 1GB/s from/to Multi-threaded I/O Link layer to/from SiS963L.