Has anyone ever seen this bizar memory problem

ok my machine is a core i7 920 gigabyte mb. i am running a 64bit OS (windows 7 x64) however the computer does see all 6gb of memory but says only 4gb is usuable. whats even more bizzare is that windows see's there is 6gb ram but bios or that black scvreen when you first boot only see's 4gb? how is this possable that windows see's more then bios and in fact there is 6gb ddr3 1600 memory installed.

please help figure this problem out or diagnose it

the memory is gskill ddr3 1600 cas 8 however it is running at 1420mhz with cas 7
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More about bizar memory problem
  1. only thing i can think of is i did have a 2gb ram disk using ramdisk software but i formated everything back to zeros when i re-installed everything
  2. bad DIMM or something like that. Assuming you have 3x2GB DIMMs, can you try moving one of them to another slot and see if that makes any difference.
  3. System congfig utility
    boot tab
    advanced options
    uncheck max memory if its checked
    Also your ram settings could be unstable
    try mobo default ram settings and see if your ram is reported properly
    are very helpful diagnosing ram issues
  4. ok yea at stock speeds same problem.

    ok found system config utility the box is unchecked
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