Does this mean my processor is a 64bit?

No. This is the width of the FSB (Socket A) or HTT-Link (Socket 754 & 939); this can also mean the width of the memory bus. Think of 'bus width' as a highway. For a lack of a better example, a 64-bit wide bus is 4 lanes; a 128-bit bus is 8 lanes. Theoretically, the more lanes there are, the more data that can be passed through.

For your processor to be 64-bit, assuming you're using a Sempron, it must be Socket 754 and have been purchased recently (since they were released about a month or two ago).

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if you still have your amd retail box, the serial code must have a BX in it to be 64 bit

mine says

SCA2800BXBOX

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NO PC As Of NOW!

I'll still be on here once in a while.