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.

Name Effective Clock Speed Data Bus Bandwidth
SDRAM133 PC133 133 MHz 64 Bit 1.06 GB/s
DDR266 PC2100 133 MHz 64 Bit 2.1 GB/s
DDR266-Dual PC2100 133 MHz 64 Bit 4.2 GB/s
DDR333 PC2700 166 MHz 64 Bit 2.7 GB/s
DDR333-Dual PC2700 166 MHz 64 Bit 5.4 GB/s
DDR400 PC3300 200 MHz 64 Bit 3.3 GB/s
RDRAM 400 PC800 400 MHz 16 Bit 1.6 GB/s
RDRAM 400-Dual PC800 400 MHz 16 Bit 3.2 GB/s
RDRAM 533 PC1066 533 MHz 16 Bit 2.1 GB/s
RDRAM 533-Dual PC1066 533 MHz 16 Bit 4.2 GB/s

Comparison: Eight Chipsets For Pentium 4

These table lists all of the chipsets for Socket 478.

Chipset SiS 645DX SiS 645 Intel 850E Intel 850
Introduction March 2002 November 2001 June 2002 January 2001
Processor Plattform Socket 478 Socket 478 Socket 478 Socket 423/478
Supported CPU Intel Pentium 4 Intel Pentium 4 Intel Pentium 4 Intel Pentium 4
Multiprocessor Support no no yes yes
Chipset Northbridge SiS 645DX SiS 645 Intel KC82850E Intel KC82850
Chipset Southbridge SiS 961 SiS 961 Intel 82801 BA Intel 82801 BA
Front Side Bus Clock 100/133 MHz 100 MHz 100/133 MHz 100/133 MHz
Memory Clock 100/133/166 MHz 100/133/166 MHz 400 MHz/533 MHz 400 MHz
Asynchronous Memory Clock yes yes yes yes
FSB-Overclocking up to 166 MHz up to 133 MHz up to 166 MHz up to 133 MHz
max. # DIMM-Slots 3 3 4 4
max. Memory 3072 MB 3072 MB 2048 MB 2048 MB
SDRAM Support yes yes no no
DDR SDRAM Support yes yes no no
VC SDRAM Support no no no no
RIMM Support (Rambus) no no yes yes
Dual RIMM Support (Rambus) no no yes yes
Ultra-DMA/33/66/100 yes/yes/yes yes/yes/yes yes/yes/yes yes/yes/yes
Ultra-DMA/133 no no no no
Max. # USB 4 4 4 4
USB 2.0 no no yes no
Max.# PCI Slots 6 6 6 6
Integrated Graphics yes yes no no
AGP 1x / 2x / 4x yes / yes / yes yes / yes / yes yes / yes / yes yes / yes / yes
ACPI Features yes yes yes yes
Chipset Intel 845D Intel 845 VIA P4X266 VIA P4X266A
Introduction December 2001 July 2001 August 2001 December 2001
Processor Plattform Socket 478 Socket 423/478 Socket 423/478 Socket 478
Supported CPU Intel Pentium 4 Intel Pentium 4 Intel Pentium 4 Intel Pentium 4
Multiprocessor Support no no no no
Chipset Northbridge Intel 82845 Intel 82845 VIA VT8753 VIA P4X266A
Chipset Southbridge Intel 82801 BA Intel 82801 BA VIA VT8233 VIA VT8233A
Front Side Bus Clock 66/100/133 MHz 66/100/133 MHz 100 MHz 100 MHz
Memory Clock 100/133 MHz 100/133 MHz 100/133 MHz 100/133 MHz
Asynchronous Memory Clock yes yes yes yes
FSB-Overclocking up to 166 MHz up to 180 MHz up to 180 MHz up to 180 MHz
max. # DIMM-Slots 3 4 4 4
max. Memory 2048 MB 2048 MB 4096 MB 3072 MB
SDRAM Support no yes yes yes
DDR SDRAM Support yes no yes yes
VC SDRAM Support no no yes yes
RIMM Support (Rambus) no no no no
Dual RIMM Support (Rambus) no no no no
Ultra-DMA/33/66/100 yes/yes/yes yes/yes/yes yes/yes/yes yes/yes/yes
Ultra-DMA/133 no no no yes
Max. # USB 4 6 6 6
USB 2.0 no yes no yes
Max.# PCI Slots 6 6 5 5
Integrated Graphics no no no no
AGP 1x / 2x / 4x yes / yes / yes yes / yes / yes yes / yes / yes yes / yes / yes
ACPI Features yes yes yes yes
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