PCA9544APW is a 4-CHANNEL IC AND SMBus MULTIPLEXER WITH INTERRUPT LOGIC .
The Northbridge typically handles communications among the CPU, in
some cases RAM, and PCI Express (or AGP) video cards, and the
Sourthbridge. Some Northbridges also contain integrated video
controllers, also known as a Graphics and Memory Controller Hub (GMCH) in Intel systems. Because different processors and RAM
require different signaling, a given Northbridge will typically
work with only one or two classes of CPUs and generally only one
type of RAM.
There are a few chipsets that support two types of RAM (generally
these are available when there is a shift to a new standard). For
example, the Northbridge from the Nvidia nForce2 chipset will only
work with Socket A processors combined with DDR SDRAM; the Intel
i875 chipset will only work with systems using Pentium 4 processors
or Celeron processors that have a clock speed greater than 1.3 GHz
and utilize DDR SDRAM, and the Intel i915g chipset only works with
the Intel Pentium 4 and the Celeron, but it can use DDR or DDR2
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