Have 8 gigs of Ram installed but can only use 4 because it says Hardware Reserved

I have 8gigs of ram and my windows/bios recognizes it but windows only lets me use 4 while the rest is hardward reserved. I have a 64-bit windows 7(legit) and its a custom built pc.

AMD FX-8350 Eight Core 4.00ghz
CORSAIR Vengeance 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600
XFX Double D FX-787A-CDFC Radeon HD 7870 GHz Edition 2GB 256-Bit GDDR5 PCI Express 3.0 x16 HDCP
Random LG disk drive
1tb seagate hard drive
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More about gigs ram installed hardware reserved
  1. That happens, if one of the sticks does not work properly. Test them individually, to identify the dead one.
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