iXBT Labs - Computer Hardware in Detail






Shuttle AS45GTR (SiS648) Mainboard

The card of the second-echelon manufacturer is well equipped. 


  • Package of a standard design; 
  • Documentation: user manual, installation manual for IDE RAID - in English; 
  • Cables: 2 ATA66/100/133, 1 Serial ATA and FDD; 
  • Bracket with 2 IEEE 1394 ports; 
  • Bracket with 2 USB ports; 
  • Bracket with a Center/Bass connector; 
  • CD containing: 
    • drivers; 
    • user manual in PDF; 
    • DirectX 8.1; 
    • Adobe Acrobat Reader. 

The layout has several typical drawbacks: audio-ins are in front of the PCI slots and IDE RAID connectors are behind them, and when a video card is installed it's difficult to handle the memory modules. But it's not difficult to reach the jumpers when the board is already installed. Their functions are shown on the textolite.

The 3-channel switching voltage regulator incorporates 6 capacitors of 3300 uF and 3 of 1500 uF. 

The following controllers are integrated: 

  • audio controller based on the chipset's capabilities and Avance Logic ALC650 AC'97 codec supporting 5.1 audio systems;  
  • IDE RAID controller based on the HighPoint HPT372 chip, supporting RAID 0, 1 and 0+1 via the ATA133 and SerialATA protocols (with the Marvell 80i8030-TBC chip); 

  • IEEE 1394 bus controller based on the Realtek RTL8801 chip. 

There are power and reset buttons onboard. 

Non-unsoldered connectors: none.

The system monitoring is supported by the ITE IT8705F chip. What is controlled: 

  • processor voltage, +3.3, +-5 and +-12 V and VBAT; 
  • speed of 2 fans; 
  • temperatures of the processor (a built-in sensor) and the board (a built-in sensor).
There are 3 connectors for adjustable connection of fans. 

Brief characteristics of the board: memory slots - 3 DDR SDRAM; expansion slots - AGP/ 5 PCI; I/O ports - 2 COM/ LPT/ 2 PS/2/ 3 IEEE 1394/ 6 USB 2.0; dimensions - 305x245 mm.  

Adjustment can be carried out with:

jumpers and switchesJumper to clear up the CMOS 
Jumper to enable/disable IDE RAID 
BIOS based on the AwardBIOS 6.00PG from PhoenixSetup of memory timings+CAS Latency, System Performance, Addr/Cmd Rate
Setup of memory frequency+DDR200, DDR266, DDR333, DDR400
Setup of AGP bus+ 
Setup of PCI bus- 
Changeable scaler of AGP and PCI buses- 
Manual assignment of interrupts- 
Changeable FSB frequency+100-165 MHz in 1MHz steps
Changeable CPU multiplier+x8-x50
Changeable core voltage+1.1-2.4 V
Changeable memory voltage+2.55, 2.6, 2.65, 2.7, 2.75 V
Changeable chipset voltage- 
Changeable AGP bus voltage- 

We used the latest available version of the BIOS - BIOS S904. 

This is a good board with a nice pack of components and a relatively low price. 

Test results: 

Dmitry Mayorov (destrax@ixbt.com

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