My system not recognizing that I have 6gb VRAM it only displays 4gb in benchmarks and DxDiag

Hi I have 6gb ram on my GTX 780 palit jetstream, when I run benchmarks or open up the dxdiag for the displays it only says I have 4095 gb approx.

how do I fix this and make my system recognise that I have 6gb in total approximate memory?

does this affect my performance in games etc. because the system wont utilize all my VRAM, please bare with me Im really nooby at this stuff Im worried :(
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More about system recognizing 6gb vram displays 4gb benchmarks dxdiag
  1. what OS and is it 32-bit?
  2. windows 7 home premium and 64 bit
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