I've 6 gb ram (4gb usabe)

Hello,
I've a dell precision 490, ive increase my ram to 6 gb but i see that only my 4 gb are usable, ive try to enter to msconfig.exe to change boot but nothing change.Ive update my bios but nothing change too.I dont know what to do and pleaese need help.Thank You (sorry for my english)
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More about usabe
  1. Good Day, The way i see it maybe you are using 32bit Os while you should use 64bit if you wanna utilise all 6gb ram of yours....Hope that helps...
  2. i use 64 bit os wint ultimate
  3. @bledi - this is your THIRD IDENTICAL POST!!!

    Answered and Problem solved -> http://www.tomshardware.com/forum/300116-30-installed-used use (3) Identical Sticks <or> modify the BIOS (Dell/OEM probably not possible). Problem is your Socket 771 MOBO supports only Buffered/Registered aka RDIMM and in PAIRS. Dell -> http://support.dell.com/support/edocs/systems/ws490/en/ug/memory.htm#wp1043338

    --
    Post1 = http://www.tomshardware.com/forum/300102-30-usabe
    Post2 = http://www.tomshardware.com/forum/300101-30-usabe
    Post3 = http://www.tomshardware.com/forum/300116-30-installed-used
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