iXBT Labs - Computer Hardware in Detail






Jetway S446 (SiS 645) Mainboard

This is not the first board from this company in our lab, and it is quite difficult to tell one from another: a changed set of chips is overshadowed by a colorful design.


  • Package: an ordinary design for this company;
  • Documentation: a user manual in English; a folder describing the Recovery Genius functions;
  • Cables: 1 ATA66/100 (with plastic-covered connectors) and 1 FDD;
  • CD with software including:
    • drivers;
    • Award WinFlash - for BIOS flashing from Windows;
    • PC-Cillin 2000 - popular antivirus packet;
    • MagicBIOS;
    • Recovery Genius.

The layout is simple and convenient: DE and FDD connectors and audio-ins are not blocked; it's only additional power supply connectors which are placed close to the rear panel (their cables will worsen ventilation).

The feed circuits incorporate 9 capacitors of 2200 uF and 6 of 1500 uF.

There are the following controllers: AC'97 codec ALC201A from Avance Logic (audio solution) - the chip supports SPDIF, but the respective connector is lacking, though there is one for audio-outs for the front computer panel.

Non-unsoldered connectors: IDE RAID controller and connectors (on the PDC20265R from Promise for the S446R board version).

Brief characteristics of the board: memory slots - 3 DDR SDRAM; expansion slots - AGP/ 5 PCI/ CNR; I/O ports - 2 COM/ LPT/ 2 PS/2/ 4 USB (though the chipset supports 6); dimensions - 305x245 mm.

Adjustment can be carried out with:

jumpers and switches Jumper to clear up CMOS
Jumper to make possible to start up a computer with a keyboard
BIOS based on v6.00PG from Award Setup of memory timings + CAS Latency, RAS Active Time, RAS Precharge Time, RAS to CAS Delay, Write Recovery Time
Setup of memory frequency + DDR200, DDR266, DDR333
Setup of AGP bus +
Setup of PCI bus -
Changeable scaler of AGP and PCI buses -
Manual assignment of interrupts -
Changeable FSB frequency + In 1 MHz steps, 100 - 200 MHz
Changeable CPU multiplier + x8 - x50
Changeable core voltage + Up to 1.85 V in 0.025 V steps
Changeable memory voltage -
Changeable chipset voltage -
Changeable AGP bus voltage -

This is relatively cheap and stable board meant for the market niche of inexpensive and unsophisticated products.

Test results:

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