Hello,
There are 2 revisions, namely A and B, for some Sempron models.
What's the difference between them, and specifically for 2400+ if any ?

There are two steppings for the Socket A Sempron, A & B.

Between the two, there are no technical differences. Same voltage, same clock speeds, same instruction sets, etc. Here' ">http://www.amdcompare.com/us-en/desktop/ is AMD's processor reference guide.

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