iXBT Labs - Computer Hardware in Detail






EPoX 4SDA+ (SiS 645) Mainboard

The blue box hides a pre-production sample, though it is of high quality and has a rich set of accessories.


  • Package: an ordinary design for this company;
  • Documentation: a user manual in English;
  • Cables: 1 ATA66/100, 1 ATA33 and 1 FDD;
  • Bracket with two USB ports for the rear panel;
  • CD with software including:
    • drivers;
    • system monitoring program;
    • Boostek - for changing a FSB frequency from Windows;
    • Adobe Acrobat Reader;
    • Norton Ghost 6.03;
    • PC-Cillin 2000.

The layout has some disadvantages: IDE and FDD connectors are placed behind PCI slots (because of the IDE RAID controller), and audio-ins are located in front of the 2nd and 3d PCI slots. There are also two LEDs which monitor the POST procedure.

The feed circuits incorporate 6 capacitors of 3300 uF and 4 of 2200 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; IDE RAID controller supporting ATA 133 protocol on the HPT372 from HighPoint.

There are no any non-unsoldered elements on the board.

Brief characteristics of the board: memory slots - 3 DDR SDRAM; expansion slots - AGP/ 6 PCI; 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
Jumper to set a base processor frequency Auto, 100 and 133 MHz
Switches to set core voltage 1.475 - 1.85 V, 0.025 V steps
Switches to set additional core voltage From +0.025 to +0.175 V in 0.025 V steps
Switches to set memory voltage 2.5 - 3.2 V, 0.1 V step
Switches to set AGP bus voltage 1.5 - 2.2 V, 0.1 V step
BIOS based on v6.00PG from Award Setup of memory timings + CAS Latency, System Performance, DRAM Addr/Cmd Rate
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 + 1.4 - 1.85 V in 0.025 V steps
Changeable memory voltage + From +0.1 to +0.7 V in 0.1 V steps
Changeable chipset voltage -
Changeable AGP bus voltage + From +0.1 to +0.7 V in 0.1 V steps

This board from the overclocker-friendly manufacturer isn't very speedy this time. However, it is much faster than many other today's competitors. Besides, it was just a pre-production sample.

Test results:

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