Silicon Integrated Systems (SiS; ) is a company that manufactures, among other things, motherboard chipsets. The company was founded in 1987 in Hsinchu Science Park, Taiwan. Business In the late 1990s, SiS made the decision to invest in their own chip fabrication facilities. At the end of 1999, SiS acquired Rise Technology and its mP6 x86 core technology. Mainboard chipsets One of the most famous chipsets produced by SiS was the late 486-age chipset 496/497 which supported PCI bus among older ISA- and VLB-buses. Mainboards using this chipset and equipped with CPUs such as the Intel 80486DX4, AMD 5x86 or Cyrix Cx5x86 processors had performance and compatibility comparable with early Intel Pentium systems in addition to a lower price. After this late success, SiS continued positioning itself as a budget chipset producer. The company emphasized high integration to minimize the cost to implement their solutions. As such, SiS one-chip mainboard chipsets that included integrated video, such as the Socket 7-based SiS 5596, SiS 5598, and SiS 530 along with the Slot 1-based SiS 620. These were some of the first PC chipsets with such high integration. They allowed entire system solutions to be built with just a mainboard, system RAM, and a CPU. 386 & 486 (Socket 1, 2, 3) SiS 310,320,330 "Rabbit" SiS 401/402 ISA SiS 406/411 EISA, Vesa Local Bus SiS 460 ISA, Vesa Local Bus SiS 461 ISA, Vesa Local Bus SiS 471 ISA, Vesa Local Bus SiS 496/497 ISA, VLB, PCI Pentium (Socket 4,5,7) SiS 501/502/503 ISA, PCI SiS 5511/5512/5513 ISA, PCI SiS 5571 ISA, PCI SiS 5581/5582 ISA, PCI SiS 5591/5595 ISA, PCI, AGP The SiS 530 (Sindbad) with SiS 5595 southbridge supported Socket 7, SDRAM 1.5GB max., a bus frequency from 66 MHz to 124 MHz, and can have from 2 to 8 MiB shared memory for an integrated AGP SiS 6306 2D/3D graphics controller. Includes integrated UDMA66 IDE controller. mainboards using the SiS 530 were positioned as cheap office platforms and paired often with low-cost chips from Intel competitors, such as the AMD K6 series or Cyrix 6x86. The graphics controller had Direct3D 6.0 and OpenGL support, although it was a very low-performance product for 3D acceleration. SiS 540 (Spartan) integrates SiS 300 graphics controller. Socket 370, Slot 1 SiS 600/SiS 5595 SiS 620/SiS 5595 SiS 630 - includes North- and South bridges (SiS 960) and 2D/3D graphics controller (SiS 305) on one