Silicon Integrated Systems


Silicon Integrated Systems 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.Silicon Integrated Systems acquired Hycon Technology on January 1, 2025. The acquisition involved SiS issuing 0.8713 shares for every Hycon share, totaling 27,755,080 shares.

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
ChipsetRelease datePart numbersSouth BridgeSocketProcessorsFSBMemory typesMax. memoryParity/ECCL2 Cache TypeVLB supportPCI support
SiS 310, 320, 3301991SiS 85C310,
SiS 85C320,
SiS 85C330		N/A132-pin PGA386DX25/33/40 MHzFPM32 MB??Async.NoNo
SiS 401/402SiS 85C401,
SiS 85C402		N/A132-pin PGA, Socket 1/2/3386DX, 5V 48625/33/40/50 MHzFPM64 MBParityAsync.No
SiS 406/4111991?SiS 85C406,
SiS 85C411		N/A132-pin PGA, Socket 1/2/3386DX, 5V 48625/33/40/50 MHzFPM64 MBParityAsync.No
SiS 4601993SiS 85C460N/A132-pin PGA, Socket 1/2/3386DX, 5V 48625/33/40/50 MHzFPM64 MBParityAsync.YesNo
SiS 461SiS 85C461N/A132-pin PGA, Socket 1/2/3386DX, 5V 48625/33/40/50 MHzFPM64 MBParityAsync.YesNo
SiS 4711994SiS 85C471N/ASocket 1/2/35 V/3.3 V 486, Am5x86, Cx5x86, Pentium Overdrive25/33/40/50 MHzFPM128 MBParityAsync.YesNo
SiS 496/4971995SiS SiS85C496,
SiS SiS85C497		SiS 497Socket 1/2/35 V/3.3 V 486, Am5x86, Cx5x86, Pentium Overdrive25/33/40/50 MHzFPM, EDO256 MBParityAsync.Yes2.0

Pentium (Socket 4,5,7)

  • SiS 501/502/503 ISA, PCI
  • SiS 5511/5512/5513 ISA, PCI
  • SiS 5571 ISA, PCI
  • SiS 5581 ISA, PCI
  • SiS 5582 ISA, PCI
  • SiS 5591/5595 ISA, PCI, AGP
The SiS 530 with SiS 5595 southbridge supported Socket 7, SDRAM 1.5 GB 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 integrates SiS 300 graphics controller.
ChipsetRelease datePart numbersSouth BridgeSocketProcessorsFSBMemory typesMax. memoryMax. cacheableParity/ECCL2 Cache TypePCI supportGraphics slotIGP
SiS 501/502/5031995SiS 85C501,
SiS 85C502,
SiS 85C503		SiS 503Socket 4
Socket 5/7		Pentium, AMD K5, Cyrix 6x8650/60/66 MHzFPM128 MB128 MBN/AAsync.2.0N/ANo
SiS 5101/5102/51031995SiS 5103Socket 4
Socket 5/7		Pentium, AMD K5, Cyrix 6x8650/60/66 MHzFPM, EDO512 MB512 MBN/AAsync.2.0N/ANo
SiS 5501/5502/55031995SiS 5503Socket 4
Socket 5/7		Pentium, AMD K5, Cyrix 6x8650/60/66 MHzFPM, EDO512 MB?N/AAsync.2.0N/ANo
SiS 5511/5512/55131995SiS 5513Socket 5/7Pentium, AMD K5, Cyrix 6x8650/60/66 MHzFPM, EDO512 MB
1 GB may be possible		?ParityAsync. / Pburst2.1N/ANo
SiS 5596/55131996SiS 5513Socket 5/7Pentium, Pentium MMX, 6x86, AMD K5/K6, Rise mP6, IDT Winchip50/60/66 MHzFPM, EDO512 MBN/AAsync. / Pburst2.1N/ASiS 6205
SiS 55711996Northbridge integratedSocket 7Pentium, Pentium MMX, 6x86, AMD K5/K6, Rise mP6, IDT Winchip50/60/66/75 MHzFPM, EDO, SDRAM384 MB64 MB?N/AAsync. / Pburst2.1N/ANo
SiS 51201997Northbridge integratedSocket 7Pentium, Pentium MMX, 6x86, AMD K5/K6, Rise mP6, IDT Winchip50/60/66/75 MHzFPM, EDO, SDRAM384 MB128 MBN/AAsync. / Pburst2.1N/ANo
SiS 55811997Northbridge integratedSocket 7Pentium, Pentium MMX, 6x86, AMD K5/K6, Rise mP6, IDT Winchip50/60/66/75 MHzFPM, EDO, SDRAM384 MB128 MBN/AAsync. / Pburst2.1N/ANo
SiS 55821997Northbridge integratedSocket 7Pentium, Pentium MMX, 6x86, AMD K5/K6, Rise mP6, IDT Winchip50/60/66/75 MHzFPM, EDO, SDRAM384 MB128 MBN/AAsync. / Pburst2.1N/ANo
SiS 55971997Northbridge integratedSocket 7Pentium, Pentium MMX, 6x86, AMD K5/K6, Rise mP6, IDT Winchip50/60/66/75 MHzFPM, EDO, SDRAM384 MB128 MBN/AAsync. / Pburst2.1N/ASiS 5597
SiS 55981997Northbridge integratedSocket 7Pentium, Pentium MMX, 6x86, AMD K5/K6, Rise mP6, IDT Winchip50/60/66/75 MHzFPM, EDO, SDRAM384 MB128 MBN/AAsync. / Pburst2.1N/ASiS 5598
SiS 5591/55951998SiS 5595Socket 7Pentium, Pentium MMX, 6x86, AMD K5/K6, Rise mP6, IDT Winchip50/60/66/75 MHzFPM, EDO, SDRAM768 MB256 MBN/AAsync. / Pburst2.1AGP 1×/2×No
SiS 5592/55951998SiS 5595Socket 7Pentium, Pentium MMX, 6x86, AMD K5/K6, Rise mP6, IDT Winchip50/60/66/75 MHzFPM, EDO, SDRAM768 MB256 MBN/AAsync. / Pburst2.1AGP 1×/2×No
SiS 5301998SiS 5595Socket 7Pentium, Pentium MMX, 6x86, AMD K5/K6, Rise mP6, IDT Winchip66/75/83/90/95/100 MHzFPM, EDO, SDRAM1536 MB256 MBN/AAsync. / Pburst2.2N/ASiS 6306
SiS 5401999Northbridge integratedSocket 7Pentium, Pentium MMX, 6x86, AMD K5/K6, Rise mP6, IDT Winchip66/75/83/90/95/100 MHzSDRAM, VCSDRAM1536 MB512 MBECCAsync. / Pburst2.2N/ASiS 300

Socket 370, Slot 1

  • SiS 600/SiS 5595
  • SiS 620/SiS 5595
  • SiS 630 - includes North- and South bridges and 2D/3D graphics controller on one chip
  • SiS 633
  • SiS 635
ChipsetRelease dateSouth BridgeSocketProcessorsFSBMemory typesMemory busMax. memoryGraphics slotIGP
SiS 56001998SiS 5595Slot 1Pentium II/III, Celeron66/100 MHzFPM, EDO, SDRAM66/100 MHz SDR1.5 GBAGP 1×/2×No
SiS 6001998SiS 5595Slot 1Pentium II/III, Celeron66/100 MHzFPM, EDO, SDRAM66/100 MHz SDR1.5 GBAGP 1×/2×No
SiS 620Aug 1998SiS 5595Slot 1, Socket 370Pentium II/III, Celeron66/100 MHzSDRAM66/100 MHz SDR1.5 GBN/ASiS 6306
SiS 6302000Northbridge integratedSlot 1, Socket 370Pentium II/III, Celeron66/100/133 MHzSDRAM, VCSDRAM66/100/133 MHz SDR1.5 GBN/ASiS305
SiS 630S2000Northbridge integratedSlot 1, Socket 370Pentium II/III, Celeron66/100/133 MHzSDRAM66/100/133 MHz SDR1.5 GBAGP 2×/4×SiS305
SiS 630ST2001Northbridge integratedSocket 370Pentium III, Tualatin, Celeron66/100/133 MHzSDRAM66/100/133 MHz SDR1.5 GBAGP 2×/4×SiS305
SiS 630E2000Northbridge integratedSlot 1, Socket 370Pentium II/III, Celeron66/100/133 MHzSDRAM66/100/133 MHz SDR1.5 GBN/ASiS305
SiS 630ET2001Northbridge integratedSocket 370Pentium III, Tualatin, Celeron66/100/133 MHzSDRAM66/100/133 MHz SDR1.5 GBN/ASiS305
SiS 6332001Northbridge integratedSocket 370Pentium III, Celeron66/100/133 MHzSDRAM66/100/133 MHz SDR1.5 GBAGP 2×/4×SiS305
SiS 633T2001Northbridge integratedSocket 370Pentium III, Tualatin, Celeron66/100/133 MHzSDRAM66/100/133 MHz SDR1.5 GBAGP 2×/4×SiS305
SiS 6352001Northbridge integratedSocket 370Pentium III, Celeron66/100/133 MHzSDRAM, DDR100/133 MHz SDR, 200/266 MHz DDR1.5 GBAGP 2×/4×No
SiS 635T2001Northbridge integratedSocket 370Pentium III, Tualatin, Celeron66/100/133 MHzSDRAM, DDR100/133 MHz SDR, 200/266 MHz DDR1.5 GBAGP 2×/4×No
SiS 640TNever releasedSiS961, SiS961BSocket 370Pentium III, Tualatin, Celeron66/100/133 MHzSDRAM, DDR100/133 MHz SDR, 200/266 MHz DDR?1.5 GBAGP 2×/4×?SiS315