Club 3D 7870 XT memory showing differently

I just bought this card, plugged it in, installed everything and it runs dam good. But I noticed something odd, when I go to dxdiag and under display it shows that I have 4096 Mb video memory. When I run 64-bit dxdiag it shows only 751 Mb. GPU-Z shows 2048 Mb as it should. Anyone knows what is up with that? I thought the old HD6770 drivers were the issue but i sweeped all AMD drivers before uninstalling new ones.
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More about club 7870 memory showing differently
  1. Don't even worry about it.
  2. Don`t worry, I won`t, but I was just curious.
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Video Memory DxDiag Club 3D Graphics