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Preview of ASUS P4SDX SiS655 motherboard
By CPU-zilla
Category : Mainboard
Published by Jimmy Tang on Wednesday, 30th October, 2002

Introducing SiS655 - The Dual Channel DDR333 Chipset

When I came into the office today, everything was proceeding normally when all of a sudden, my mailbox was jammed for a couple of minutes. I was rather puzzled and was about to point my finger at the service provider when I realized that the jam was caused by a large e-mail attachment. It took a while before it got through but when it did, it was an e-mail from our friends at ASUS.

What looked like a normal product release turned out to be a shocker when we unzipped the attachment. Inside, ASUS revealed to us for the first time, pictures and specifications of their newest SiS-based motherboard for the Intel Pentium 4. The new SiS655 chipset is not even revealed at the SiS website and here, ASUS already had a sample.

Although information was scarce, we later realized that the SiS655 is the next generation of P4 chipset that will support dual-channel DDR333 memory. This would immediately bring obsolescence to Intel's much anticipated Granite Bay as its theoretical memory bandwidth is much larger - up to 5.4GB/s while dual-channel DDR266 chipsets would only deliver 4.2GB/s. Of course, we know sometimes that numbers don't mean much but there's nothing wrong with wishful thinking, right?.

Here's a quick look at the specifications of the board. The information here could change drastically, so, don't stone us if you can't find a board with such features in the future.

ASUS P4SDX Technical Specifications (subject to changes)
  • Socket 478 for Intel® Pentium 4 / Celeron processors
  • Intel® Pentium 4 Processors 1.4GHz - 2.80GHz or higher
  • Intel® Celeron Processors 1.7GHz - 2.2GHz or higher
  • Supports processors at 400 / 533MHz front side bus
  • SiS 655 Open Architecture DDR333 Chipset
    • Supports DDR333/DDR266/DDR200 SDRAM DIMMs
    • Supports dual channel DDR333
    • 400/533MHz system bus
    • AGP 4x/8x
  • SIS 963 MuTIOL Medio I/O Chipset
    • Bi-directional 16-bit data bus at 533MHz operating frequency
    • Proprietary interconnect between SiS north-south bridge at 1GB/s bandwidth
    • 2-channel Ultra ATA 133/100/66/33 Bus Master IDE controller
    • Six USB 2.0 ports
    • Supports AC'97 v2.2 audio and modem codec
    • ACPI 1.0b and APM 1.2 compliant
    • LPC 1.0 interface
    • PCI 2.2 interface
Cache memory
  • CPU Built-in 256KB (Willamette) or 512KB (Northwood) L2 cache for Pentium 4
  • CPU Built-in 128KB L2 cache for Celeron
System memory
  • 4 x 184-pin dual-channel DDR SDRAM DIMM
  • Supports 128/256/512MB or 1GB DIMM Module
  • Supports 2.5V DDR SDRAM
  • Supports a maximum of 4GB of memory
  • 2 x Bus Master UDMA-33/66/100/133 IDE ports (up to 4 devices)
  • Support for PIO, UDMA-33, UDMA-66, UDMA-100, UDMA-133 IDE
  • Built-in Promise PDC20376 RAID controller supporting additional two ATA133 devices and two Serial ATA devices (optional)
I/O Interface
  • 1x floppy connector (360KB - 2.88MB)
  • 2x serial ports
  • 1x parallel port (SPP/EPP/ECP)
  • PS/2 Keyboard
  • PS/2 Mouse
  • 4x USB ports
  • Audio ports for on-board sound (Line-Out, Line-In, Mic)
  • Game port
  • 2x IEEE-1394 headers
  • ASUS front panel audio connector
  • 1x IR header
  • 1x S/PDIF input/output (module optional)
  • 1x RJ45 Gigabit Ethernet port
Expansion slots
  • 6x 32-bit PCI slots, PCI 2.2 compliant
  • 1x AGP (4x/8x mode) slot
Power Management
  • Supports ACPI 1.0b (Advanced Configuration and Power Interface) and APM 1.2
  • Supports Desktop Management Interface (DMI) 2.0
Form Factor
  • ATX Form Factor : 30.5cm x 24.4cm
  • Fits into regular ATX case
  • 4Mbit (512KB) Flash EEPROM
  • Award Flash BIOS with PnP, ACPI and DMI 2.0, Green, TCAV support
  • Multi-boot on ZIP, USB, ATAPI CD-ROM, SCSI, IDE #1, #2, #3, #4

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