SiS651 IGUI Host Memory Controller integrates a high performance host interface for Intel Pentium 4 processor, a high performance 2D/3D Graphic Engine, a high performance memory controller, an AGP 4X interface, and SiS MuTIOL® Technology connecting w/ SiS962 MuTIOL® Media I/O.

SiS651 Host Interface features the AGTL & AGTL+ compliant bus driver technology with integrated on-die termination to support Intel® Pentium® 4 series processors with FSB 533/400MHz. SiS651 provides a 12-level In-Order-Queue to support maximum outstanding transactions up to 12. It integrated a high performance 2D/3D Graphic Engine, Video Accelerator and Advanced Hardware Acceleration MPEGI/MPEGII Video Decoder for the Intel® Pentium® 4 series based PC systems. It also integrates a high performance 2.7GB/s DDR333 Memory controller to sustain the bandwidth demand from the integrated GUI or external AGP master, host processor, as well as the multi I/O masters. In addition to integrated GUI, SiS651 also can support external AGP slot with AGP 1X/2X/4X capability and Fast Write Transactions. A high bandwidth and mature SiS MuTIOL® technology is incorporated to connect SiS651 and SiS962 MuTIOL® Media I/O together. SiS MuTIOL® 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 Link Encoder/Decoder in SiS962 to transfer data w/ 533 MB/s bandwidth from/to Multi-threaded I/O Link layer to/from SiS651, and the Multi-threaded I/O Link Encoder/Decoder in SiS651 to transfer data w/ 533 MB/s from/to Multi-threaded I/O.