Comparison: All Chipsets For The Pentium 4

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Chipsatz Intel 850 Intel 845D Intel 845 SiS 645 VIA P4X266A VIA P4X266
Introduction January 2001 December 2001 July 2001 November 2001 December 2001 August 2001
Supported Processors Intel Pentium 4 Intel Pentium 4 Intel Pentium 4 Intel Pentium 4 Intel Pentium 4 Intel Pentium 4
SMP-Support Yes No No No No No
Northbridge Intel KC82850 Intel 82845 Intel 82845 SiS 645 VIA P4X266A VIA VT8753
Southbridge Intel 82801 BA Intel 82801 BA Intel 82801 BA SiS 961 VIA VT8233CE VIA VT8233
Memory Clock 400 MHz RDRAM 100/133 MHz DDR-SDRAM 100/133 MHz SDRAM 100/133/166 MHz DDR-SDRAM 100/133 MHz DDR-SDRAM 100/133 MHz SDR/DDR
Asynchronous Memory Clock Yes Yes Yes Yes Yes Yes
Max. No. of Memory Slots 4 3 4 3 3 4
Max. Amount Of Memory 2048 MB 2048 MB 2048 MB 3072 MB 3072 MB 4096 MB
Memory Support RDRAM (PC600, PC800) DDR-SDRAM (PC2100, PC1600) SDRAM (PC133) DDR-SDRAM (PC2100, PC1600, PC2700 ) DDR-SDRAM (PC2100, PC1600) DDR-SDRAM (PC2100, PC1600)
No. Of Memory Channels 2 1 1 1 1 1
Max. Memory Bandwidth 3200 MB/s 2133 MB/s 1066 MB/s 2666 MB/s 2133 MB/s 2133 MB/s
Ultra-DMA/33/66/100 Yes/Yes/Yes Yes/Yes/Yes Yes/Yes/Yes Yes/Yes/Yes Yes/Yes/Yes Yes/Yes/Yes
Ultra-DMA/133 No No No No Yes No
No. Of USB Ports 4 4 6 6 6 6
USB 2.0 No No Yes Yes Yes No
max. No of PCI-Slots 6 6 6 6 6 5
This table shows all chipsets for the Pentium 4 platform. The latest one is VIA's P4X266A which will be upgraded soon with USB 2.0 and UltraATA/133 (both by coming with a new south bridge chip).

The table above lists all chipsets for the Pentium 4. Intel's 850 is the flagship product using RDRAM memory. As a result, it is both the most expensive but also one of the fastest P4-chipset. The i845 is available in two versions. There is the 'old' 845 for PC133 SDRAM as well as the today released i845D for DDR-SDRAM. Don't think that these two are different products. As a matter of fact, they are the same silicon. According to rumors and conspiracy theories, the reason for the late introduction of DDR support is a license agreement between Intel and Rambus Inc.


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