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 |
