1gb graphic card displays only 512 mb vram in windows 7 64bit edition

i instal 1gb graphic card but it displays only 512mb in my windows7 64 bit computer what,s the reason of
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More about graphic card displays vram windows 64bit edition
  1. download (and run) Gpu-z, see what it reports
    http://www.techpowerup.com/gpuz/
  2. Are you sure it is a 1GB. card or is it one of those ones that says Up to 1GB. but only has 512MB. on the card and can share up to another 512MB. of the system RAM ??
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