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I've been googling to clarify some doubts, but the only thing I find are lots of commercial stores that sell all types of memories.

I understand that if I'm talking about KVR333 or KVR400, it has to do with internal speed. Hope I'm right at this.

Next, labels show X64. Does that mean it's only for PC's running 64 bits apps? Else, what does it mean?

Next, labels show C2 (e.g. an old one KVR133X64C2/256... ... old one and X64?), or C25, or C3A
Seems C3A are 1GB, whereas C25 are 512MB, but have some C25/256...

1- Can anybody give me some link to where all these codes are clearly explained?
2- Can I mix KVR400 and KVR333 on same PC? If yes, am I wasting 400's speed in the whole lot (would all run at 333?), or is the difference negligible or even better since I'm adding additional (333) memory to the 400 dimm?

Thanks,


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