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SiS 645DX - Is This The Best Chipset For The P4?

Memory Problem: DDR333 Is Still Rare On The Market

This overview shows the various memory modules and a comparison of their maximum bandwidths.

NameEffective Clock SpeedData BusBandwidth
SDRAM133PC133133 MHz64 Bit1.06 GB/s
DDR266PC2100133 MHz64 Bit2.1 GB/s
DDR266-DualPC2100133 MHz64 Bit4.2 GB/s
DDR333PC2700166 MHz64 Bit2.7 GB/s
DDR333-DualPC2700166 MHz64 Bit5.4 GB/s
DDR400PC3300200 MHz64 Bit3.3 GB/s
RDRAM 400PC800400 MHz16 Bit1.6 GB/s
RDRAM 400-DualPC800400 MHz16 Bit3.2 GB/s
RDRAM 533PC1066533 MHz16 Bit2.1 GB/s
RDRAM 533-DualPC1066533 MHz16 Bit4.2 GB/s

Comparison: Eight Chipsets For Pentium 4

These table lists all of the chipsets for Socket 478.

ChipsetSiS 645DXSiS 645Intel 850EIntel 850
IntroductionMarch 2002November 2001June 2002January 2001
Processor PlattformSocket 478Socket 478Socket 478Socket 423/478
Supported CPUIntel Pentium 4Intel Pentium 4Intel Pentium 4Intel Pentium 4
Multiprocessor Supportnonoyesyes
Chipset NorthbridgeSiS 645DXSiS 645Intel KC82850EIntel KC82850
Chipset SouthbridgeSiS 961SiS 961Intel 82801 BAIntel 82801 BA
Front Side Bus Clock100/133 MHz100 MHz100/133 MHz100/133 MHz
Memory Clock100/133/166 MHz100/133/166 MHz400 MHz/533 MHz400 MHz
Asynchronous Memory Clockyesyesyesyes
FSB-Overclockingup to 166 MHzup to 133 MHzup to 166 MHzup to 133 MHz
max. # DIMM-Slots3344
max. Memory3072 MB3072 MB2048 MB2048 MB
SDRAM Supportyesyesnono
DDR SDRAM Supportyesyesnono
VC SDRAM Supportnononono
RIMM Support (Rambus)nonoyesyes
Dual RIMM Support (Rambus)nonoyesyes
Ultra-DMA/33/66/100yes/yes/yesyes/yes/yesyes/yes/yesyes/yes/yes
Ultra-DMA/133nononono
Max. # USB4444
USB 2.0nonoyesno
Max.# PCI Slots6666
Integrated Graphicsyesyesnono
AGP 1x / 2x / 4xyes / yes / yesyes / yes / yesyes / yes / yesyes / yes / yes
ACPI Featuresyesyesyesyes
ChipsetIntel 845DIntel 845VIA P4X266VIA P4X266A
IntroductionDecember 2001July 2001August 2001December 2001
Processor PlattformSocket 478Socket 423/478Socket 423/478Socket 478
Supported CPUIntel Pentium 4Intel Pentium 4Intel Pentium 4Intel Pentium 4
Multiprocessor Supportnononono
Chipset NorthbridgeIntel 82845Intel 82845VIA VT8753VIA P4X266A
Chipset SouthbridgeIntel 82801 BAIntel 82801 BAVIA VT8233VIA VT8233A
Front Side Bus Clock66/100/133 MHz66/100/133 MHz100 MHz100 MHz
Memory Clock100/133 MHz100/133 MHz100/133 MHz100/133 MHz
Asynchronous Memory Clockyesyesyesyes
FSB-Overclockingup to 166 MHzup to 180 MHzup to 180 MHzup to 180 MHz
max. # DIMM-Slots3444
max. Memory2048 MB2048 MB4096 MB3072 MB
SDRAM Supportnoyesyesyes
DDR SDRAM Supportyesnoyesyes
VC SDRAM Supportnonoyesyes
RIMM Support (Rambus)nononono
Dual RIMM Support (Rambus)nononono
Ultra-DMA/33/66/100yes/yes/yesyes/yes/yesyes/yes/yesyes/yes/yes
Ultra-DMA/133nononoyes
Max. # USB4666
USB 2.0noyesnoyes
Max.# PCI Slots6655
Integrated Graphicsnononono
AGP 1x / 2x / 4xyes / yes / yesyes / yes / yesyes / yes / yesyes / yes / yes
ACPI Featuresyesyesyesyes