CPU's

The Intel? 840 chipset was specifically designed to meet the needs of high performance multi-processor systems. The 840 chipset, together with the latest Intel? Pentium? III or Intel? Pentium? III Xeon? processors, provides new levels of performance, scalability, and end user productivity.

A New Design with Big Benefits

The Intel? 840 chipset utilizes the new modular design of the 800 family of chipsets. Like other 800 series chipsets, the 840 chipset has two core components:

The 82840 Memory Controller Hub (MCH) differentiates the Intel? 840 chipset from other Intel? 800 series chipsets. The MCH provides graphics support for AGP 2X/4X, dual RDRAM* memory channels, and multiple PCI segments for high performance I/O.

The 82801 I/O Controller Hub (ICH) utilizes Intel? Hub Architecture to make a direct connection to the MCH. The ICH supports 32-bit PCI, IDE controllers and dual USB ports.

In addition to providing high performance, the Intel? 840 chipset was designed for scalability. Two components may be used with the core components:
The model prices differ because Intel deloped the 840 with enhancements

The higher the number, the more features. Hence more expensive.

http://tinyurl.com/eq2uw

Click on one of the Processor Numbers, 840 for example.
Click on Learn about Processor Numbers.

The 840 is more expensive because it was the first Intel chip with Scalable Bandwidth Technology (which meant that it could better adapt to increased demands than the 820 chipset).

An 820 Intel 820 is a Dual Core without Hyper threading and the 840 is the high end Dual Core with Hyper threading. It's also called the Pentium Extreme so it really pack much more punch or processing power into the same size package.

http://tinyurl.com/dvfd3

Col

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