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Pentium 4 Chipsets

VIA Teams Up Pentium 4 With DDR-Memory
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So far only one platform has been available for Pentium 4, Intel's 850 RDRAM chipset. Now VIA is starting to ship its P4X266 and in a few weeks Intel will release the first 'step' of the i845 chipset. We made a little comparison table to give you an overlook of the different features.

Chipset VIA P4X266 Intel 845 Intel 850
Launch August 2001 September 2001 November 2000
CPU-Platform Sockel 423/478 Sockel 423/478 Sockel 423/478
Supported Processors Intel Pentium 4 Intel Pentium 4 Intel Pentium 4
SMP-Support No No Yes
Chipset Northbridge VIA VT8753 Intel 82845 Intel 82850
Chipset Southbridge VIA VT8233 Intel 82801 BA Intel 82801 BA
Front Side Bus Clock 100 MHz (quad pumped) 100 MHz (quad pumped) 100 MHz (quad pumped)
Memory Clock 100/133 MHz SDR/DDR 100/133 MHz SDR/DDR 400 MHz
asynchronuous Memory Clock Yes No No
FSB-Overclocking* up to 200 MHz up to 180 MHz up to 133 MHz
max. number of memory-Slots 4 4 4
max. amount of Memory 4096 MB 2048 MB 2048 MB
SDRAM Support Yes Yes No
DDR-SDRAM Support Yes Yes, but not supported until Q1/2002 No
VC-SDRAM Support Yes No No
RDRAM Support No No Yes
Dual Channel RDRAM Support No No Yes
Max. Memory Bandwidth 2133 MB/s 1066 MB/s for the time being 3200 MB/s
Ultra-ATA/33/66/100 Yes/Yes/Yes Yes/Yes/Yes Yes/Yes/Yes
Number of USB Ports 6 6 4
USB 2.0 No Yes No
max. number of PCI-Slots 5 6 6
integrated Graphics No No No
AGP 1x / 2x / 4x Yes / Yes / Yes Yes / Yes / Yes Yes / Yes / Yes
ACPI-Features Yes Yes Yes
* depending on clock generator chip

We know that i850 is an RDRAM-only solution, which makes it expensive. Its dual-channel Rambus architecture however allows a memory bandwidth of up to 3200 MB/s, which is identical to Pentium 4's processor bus bandwidth.

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