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PC100

PC66/100/133 are all interchangable. They will run at the speed of the slowest module but PC133 is quite happy being down-clocked.
 
... but you can't run PC100 RAM in a system that requires PC133. The other way round is fine.

Compatibility problems stem from chipset limitations, mainly in what capacity the RAM chips may have. For example, most 1st generation SDRAM chipsets don't do more than 128 megabits per chip.
 
Originally posted by: cmdrdredd
Originally posted by: ding5550123
so i cant put pc 100 in pc 133 slots
Click to expand...



you can, but it will only run at PC100 speeds which is a waste when you can get PC133
Click to expand...

No, not always. Look at what Peter posted. I've seen boards here at work that have silkscreened on them, "PC-133 MEMORY ONLY".

Best bet is to go to the websites of Kingston, Corsair, or Crucial, and look up your board to see what they recommend. Then try to find it elsewhere cheaper.
 
Usually you can interchange them but some boards are picky and freak out. I have a old P2 with both pc100 and pc133, it just down-clocked the pc133 and away she went.
 
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