iXBT Labs - Computer Hardware in Detail






AOpen AX4B Pro (i845D) Mainboard

The board from the famous company is based on the black textolite with a silvery aluminum heatsink.


  • Package of a typical colorful design with a cut-out;
  • Documentation: a user manual in 4 languages; a poster with brief description of functional connectors and switches;
  • Cables: 1 ATA66/100 and 1 FDD;
  • Register card for a user;
  • CD including:
    • drivers;
    • manuals for many AOpen boards;
    • system monitoring programs;
    • Adobe Acrobat Reader;
    • DocuCom;
    • E-Color;
    • Norton Crash Guard;
    • Norton Antivirus 98;
    • Norton Antivirus 2001.

The layout is rather good, except audio-ins which are located in front of PCI slots. It's not difficult to reach jumpers even when the board is already installed. On the back side there is a plastic plate meant for massive coolers.

The 3-channel switching voltage regulator incorporates 12 capacitors of 2200 uF.

The following controllers are integrated: an audio one based on the capabilities of the chipset and an Analog Devices codec (AD1885).

The board supports AOpen's Dr. Voice technology (which reports about problems occurred during booting), and there is space for the second EEPROM chip for the DieHard BIOS technology (similar to the DualBIOS of Gigabyte).

Non-unsoldered connectors: connectors for readers of smart cards and flash cards of the Memory Stick format. To realize them it's necessary to have a different I/O connector.

The system monitoring is supported. Processor voltage (+/-3.3, +/-5 and +/-12 V), speed of 3 fans and temperatures of the processor (a built-in sensor) and the board (a built-in sensor) can be controlled. There are 3 connectors for adjustable connection of fans.

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; dimensions - 305x245 mm.

Adjustment can be carried out with:

jumpers and switches Jumper to clear up the CMOS
Jumper to make possible to start up a computer with a PS/2 keyboard
Jumper to enable/disable an integrated piezoelectric speaker
Jumpers to choose a language of the Dr. Voice function English, German, Chinese, Japanese
Jumpers to choose a mode of the DieHard BIOS function Normal/Rescue
BIOS based on v6.00PG from Award Setup of memory timings + CAS Latency, RAS to CAS Delay, RAS Precharge Delay, Active Precharge Delay, Idle Timer
Setup of memory frequency + DDR200/DDR266
Setup of AGP bus +
Setup of PCI bus +
Changeable scaler of AGP and PCI buses -
Manual assignment of interrupts -
Changeable FSB frequency + 100, 105, 111, 120, 133 MHz
Changeable CPU multiplier + x8-x50
Changeable core voltage -
Changeable memory voltage -
Changeable chipset voltage -
Changeable AGP bus voltage -

We used the latest available version of the BIOS - 1.02.

The board has an average speed, is quite stable and will be a good purchase for an average user.

Test results:

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