Heres my Setup :

My Pc

Operating System : WINDOWS 7 ULTIMATE 64 BIT

Case : Cooler Master Haf 932 with added 120 mm bottom case fan


Processor : i7 930 2.80ghz


RAM : 12gb kit of OCZ Reaper Edtion 1333 DDR3 Trichannel Kit 12gb ( 3x 4gb)


Motherboard : EVGA x58 Sli LE


Graphics Card : Evga 460 GTX DDR5 768MB


Heatsink Fan : Hyper 520 N


Power Supply : Ultra LSP650 650-Watt Power Supply



Did overclocking .... got my processor from 2.8 to 3.5 and have the ram from 1333mhz to 1338 mhz... Used the Pc for 3 months with out 1 issue, and then i turned my system on yesterday and only saw 6+ ram available in my sidebar gadget. Then checked Properties and Noticed that it said 18GB MEMORY (RAM) INSTALLED: (10.5) USABLE . So i figured i had a bad stick , so i went to my local Comp Usa and bought a 8 gb kit to test ... Same Problem ... Did a completely fresh install of windows 7, thinking that might help .... 4 to 8 hours that i will never see again .... I have seated the Ram Modules in 1,3,5 and then 2,4,6 then individually.

ANY suggestions or something i should try let me know ..... i do not wanna R.M.A if this is Windows 7 Fault .... Thanks Everyone
6 answers Last reply
More about memory installed usable
  1. Here are some screen shots of what i mean ...

    Heres Windows 7 Properties :

    Heres my Windows 7 Sidebar :

    Heres Everest Detecting ALL my ram : ( Note Problem began with OCZ RAM alone 3 x 4gb sticks in slots 1 , 3 ,5 trichannel )

  2. Try disabling Memory Remapping in BIOS. Reboot to Windows, then restart again, enable Memory Remapping.
  3. The usable memory may be less than the installed memory on Windows 7-based computers

  4. 1. Click Start, type msconfig in the Search programs and files box, and then click msconfig in the Programs list.
    2. In the System Configuration window, click Advanced options on the Boot tab.
    3. Click to clear the Maximum memory check box, and then click OK.
    4. Restart the computer.

    Does that help?
  5. If that still doesn't help, BEFORE trying last resort Remove all partitions and reformat your computer; Try unplug all sticks and only one stick remains, then boot computer. Then shutdown again. Plug all sticks again, then turn on the computer.
  6. problem was 1 defective stick
Ask a new question

Read More

Memory RAM Product