But... I don't think that's what that number means... let me look this up.
[edit]
Ok here we go.
That number is the number of megabits, (not megabytes) of the capacity of the module.
So, it's 2048 megabits.
Well, how many bits are in a byte? You should know this. It's 8.
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Side not for future knowledge:
b=bits
B=bytes
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2048Mb/8Mb = 256MB
The Module is 256MB.