12.8 GB/S on my Xfx Gt 220 ddr2??

I read on the net for my card here is the link:

It clearly shows 25.3gb/s memory speed.. But gpu-z showing only 12.8. How that?
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  1. Best answer
    It is DDR memory (stands for Double data rate) so it will always show half the value as far as I know.
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