Defintions

[jonkey]

What exactly when translated do the abbreviations "DDR"
and "FSB" mean in relation to microprocessors

 

[Bruce Chambers]

Greetings --

A useful link to remember:

http://whatis.techtarget.com/

DDR = Double Data Rate.

DDR SDRAM (double data rate SDRAM) is synchronous dynamic RAM (SDRAM)
that can theoretically improve memory clock speed to at least 200
MHz*. It activates output on both the rising and falling edge of the
system clock rather than on just the rising edge, potentially doubling
output. It's expected that a number of Socket 7 chipset makers will
support this form of SDRAM.

FSB = Front-Side Bus. In a personal computer with an Intel processor
chipset that includes a Dual Independent Bus (DIB), the frontside bus
is the data path and physical interface between the processor and the
main memory (RAM).


Bruce Chambers

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[Alex Nichol]

What exactly when translated do the abbreviations "DDR"
and "FSB" mean in relation to microprocessors

They relate to the methods used for accessing the RAM (Random Access
Memory). Modules of that use varying technologies - the most common
coming in two speeds: Single data (SD RAM) and dual data-rate (DDR)

The clock that drives the system provides different frequencies around
to 'data buses' that are used for different needs - central to this is
the 'front side bus' (FSB) used by the Central processor (which then
multiplies that or a submultiple of it up to drive it internally). This
FSB links across to a bus at a related speed for the RAM, as well as
ones for AGP and PCI cards.

So you see for example a 2600 MHZ CPU on a 533 MHz FSB - that would then
probably go with a 265 MHz memory one for 'PC 2600' DDR RAM