The SiS748 features an AGP 8X bridge, and a DDR400 Memory controller, supporting AMD Athlon™ XP processor FSB up to 400MHz. The SiS748, via the second-generation 1 GB/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 SiS748 DDR400 memory controller delivering 3.2G/B bandwidth way adequate and satisfactory to the 400MHz S2K FSB bandwidth demand of 3.2GB/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 SiS748 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 SiS748, and the Multi-threaded I/O Packet Layer in SiS748 to transfer data w/ 1 GB/s from/to Multi-threaded I/O Link layer to/from SiS963L.