8 GB RAM only 3.90 GB Usable

8GB Only 3.90 GB usable
as per mobo manual i install KHX1600C9D3B1/4G RAM on slot A2 and B2



But BIOS show only 4 GB total RAM

CPUZ show 8GB But Windows show 8GB 3.90 GB usable



Same happen if i install RAM on A1 B1 slot
PC won't Boot if i install RAM on B1 B1 slot
If i install RAM on A1 A2 slot

BIOS show 8GB RAM

Windows also able to use all 8 GB RAM now

I Build totally new PC With
2x Kingston HyperX Blu DDR3 4 GB PC RAM (KHX1600C9D3B1/4G)
AMD FX 6300 (no overclock ) none pin bend
Asus M5A97 LE R2.0

Help me guys
7 answers Last reply
More about ram usable
  1. install ram, slots 1 and 3 or 2 and 4 ok then it should post alright.
  2. johnnyb105 said:
    install ram, slots 1 and 3 or 2 and 4 ok then it should post alright.


    if i put it on slot 1 & 3 i get only 4gb ram

    windows show me 8GB (3.97GB usable) same with slot 2 & 4

    if i put it in slot 1 & 2 is see all 8GB ram usable . but that's only on Single Channel mode
  3. main post update with detail . plz help me guys
    mod plz move this post to RAM section if required
  4. press windows key and r

    type msconfig

    click on boot, then advanced options, and make sure both cpu and ram is unchecked at the top then restart.
  5. aj2013 said:
    press windows key and r

    type msconfig

    click on boot, then advanced options, and make sure both cpu and ram is unchecked at the top then restart.


    it's already unchecked
  6. BUMP
  7. is it motherboard issue . i check RAM stick and don't get any problem with it
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