iXBT Labs - Computer Hardware in Detail






AOpen AX45 (SiS 645) Mainboard

The board looks impressive: it is based on black textolite with a silvery aluminum heatsink.


  • Package: a colorful design with a typical cutout;
  • Documentation: a poster with brief description of functional connectors and settings;
  • Cables: 1 ATA66/100 and 1 FDD;
  • Register card for user;
  • CD with software including:
    • Norton Antivirus 2001.

As we have a preproduction sample, the drivers are lacking.

The layout has some disadvantages: CD-in are located in front of the PCI slots, IDE - behind them and an FDD connector is on the left edge of the board. There is a connector for a bracket with LEDs monitoring the POST procedure (Dr. Led technology), though the bracket itself is not included into the package. A special plate is mounted onto the back side of the board to prevent troubles caused by massive coolers.

The feed circuits incorporate 10 capacitors of 1500 uF and 3 of 2200 uF.

There are the following controllers: AC'97 codec ALC201A from Avance with a connector for audio-outs on the computer's front panel, and I/O 83637HF-AW controller from Winbond (supports a Memory Stick Card reader, for which there is a connector on the board).

Non-unsoldered connectors: Realtek 8100 network controller.

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

Adjustment can be carried out with:

Jumpers and switches Jumper to clear up CMOS
BIOS based on v6.00PG from Award Setup of memory timings + CAS Latency, DRAM Command Rate, System Performance
Setup of memory frequency + DDR200, DDR266, DDR333
Setup of AGP bus +
Setup of PCI bus -
Changeable scaler of AGP and PCI buses + At FSB of 100 MHz - 1:1, 3:4, 3:5. At FSB of 133 MHz - 4:3, 1:1, 4:5
Manual assignment of interrupts -
Changeable FSB frequency + 100, 100,9, 105, 108, 112, 133
Changeable CPU multiplier + x8 - x50
Changeable core voltage -
Changeable memory voltage -
Changeable chipset voltage -
Changeable AGP bus voltage -

On the one hand, the board shows great speed characteristics and has an excellent appearance; on the other hand, it lacks for a wide range of settings.

Test results:

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