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PC2100

It's PC133 SDRAM running at DDR...

It gives better performance than SDR...

It's relatively cheap...

What sort of answer are you looking for and what type of information?
 
pc2100 runs at 266mhz compared to the 133mhz of pc133. Therefore the bandwidth and speed of the memory just about doubles. i use it too from Crucial, it's awsome. hope that helps!
 
Looking at your sig I'd say you are already running it. It theroretically has 2x the bandwith of pc133, however, it usually only gets 10% more performance at the most.
 
Are you looking for real world differences or...?

PC133 SDRAM is a 64bit bus with a 133Mhz clock
PC2100 DDR is also SDRAM with a 64bit bus and a 133Mhz clock, but it's DDR (effectively doubles the clock rate, so consider it a 266Mhz clock) so you get 2x the peak bandwidth from it.

real world differences are 5-20% on a current Athlon depending on what you are doing.
The Palimino should get more benefit from DDR due to hardware prefetch.
 
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