Twice The Power: SiS655 With Dual DDR333

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16 P4 Chipsets Compared

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Header Cell - Column 0	SiS645	SiS645DX	SiS648	SiS655
Introduction	Nov-01	Mar-02	Jul-02	Dec-02
Northbridge	SiS645	SiS645DX	SiS648	SiS655
Southbridge	SiS961	SiS961	SiS963	SiS963
FSB clock	100 MHz QDR	100 MHz QDR	100, 133 MHz QDR	100, 133 MHz QDR
overclocking	Max. ~ 120 MHz	Max. ~166 MHz	Max. ~180 MHz	Max. ~180 MHz
Memory type	DDR SDRAM	DDR SDRAM	DDR SDRAM	DDR SDRAM
Memory clock	100, 133, 166 MHz DDR	100, 133, 166 MHz DDR	100, 133, 166 MHz DDR	100, 133, 166 MHz DDR
Asynchronous memory clock	yes	yes	yes	yes
Max. memory	3 GB	3 GB	2 GB	3 GB
Max. modules	3 DIMM	3 DIMM	3 DIMM	4 DIMM
Dual Channel support	no	no	no	yes
UltraATA 100/133	yes / no	yes / no	yes / yes	yes / yes
Max. #USB	6	6	6	6
USB type	USB 1.1	USB 1.1	USB 2.0	USB 2.0
Max. #PCI	6	6	6	6
AGP 4X/8X	yes / no	yes / no	yes / yes	yes / yes
Hyper Threading support	no	no	only new revisions	yes

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Header Cell - Column 0	VIA P4X266	VIA P4X266A	VIA P4X333	Ali Aladdin P4
Introduction	Aug-01	Dec-01	May-02	Dec-01
Northbridge	VT8753	P4X266A	P4X333	M1671
Southbridge	VT8233	VT8233A	VT8233A	M1535D+
FSB clock	100 MHz QDR	100 MHz QDR	100, 133 MHz QDR	100 MHz QDR
overclocking	Max. ~ 150 MHz	Max. ~ 166 MHz	Max. ~180 MHz	Max. ~150 MHz
Memory type	DDR SDRAM	DDR SDRAM	DDR SDRAM	DDR SDRAM
Memory clock	100, 133 MHz DDR	100, 133 MHz DDR	100, 133, 166 MHz DDR	100, 133 MHz DDR
Asynchronous memory clock	yes	yes	yes	yes
Max. memory	4 GB	3 GB	3 GB	3 GB
Max. modules	4 DIMM	4 DIMM	4 DIMM	3 DIMM
Dual Channel support	no	no	no	no
UltraATA 100/133	yes / no	yes / yes	yes / yes	yes / no
Max. #USB	6	6	6	6
USB type	USB 1.1	USB 2.0	USB 2.0	USB 1.1
Max. #PCI	5	5	5	7
AGP 4X/8X	yes / no	yes / no	yes / no	yes / no
Hyper Threading support	no	no	no	no

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Patrick Schmid was the editor-in-chief for Tom's Hardware from 2005 to 2006. He wrote numerous articles on a wide range of hardware topics, including storage, CPUs, and system builds.