8gb installed available 4gb

Hey people, today i received my new memory, i purchased:

Corsair XMS3 8GB (2x4GB) DDR3 PC3-12800C9 1600MHz Dual Channel Kit

Now i already had the 4gb version of this with the intention of running both , so 12gb in total but my pc wont boot with all of it.

But also when i just use the 8gb it says only 4gb usable and the other 4gb "hardware reserved"

So firstly, am i able to run both at same time.
And secondly, how can i make it so it isnt reserved.

I currently use win7 64bit

And my motherboard can go handle upto 16gb of 1600mhz memory.

Hope someone can help, thanks
8 answers Last reply
More about installed
  1. Whats your mobo?

    Do u have it installed in correct slot?
  2. My mobo is Asus P7P55D-E Intel P55 (Socket 1156) DDR3 Motherboard

    And yeah there in the right ones
  3. Boot with (1) stick then swap the stick; it's faster to rule-out a bad stick.

    Q - What CPU?
  4. You got a bad stick of RAM
  5. will try that now, i use a intel i5 760
  6. Ok so ive tried it and it boots up with both of them individually, the only difference is that the 1 stick wont boot in the first slot unlike the other stick which will boot in either of them if that helps....
  7. No, 1 stick should use the 2nd DIMM slot from the CPU; DIMM_A1

    Just to check, use only the following DIMM slots:
    CPU: | blank | 4GB | blank | 4GB | ; Blue DIMM slots only

    Intel Core i5-760 2.80 GHz

    Assuming - CORSAIR XMS3 8GB (2 x 4GB) DDR3 1600 CMX8GX3M2B1600C9
    9-9-9-24-2T @ 1.50v

    Assuming - there's no bad stick.

    BIOS:
    AI Overclock Tuner -> Auto
    DRAM Frequency -> DDR3-1600
    DRAM Timing -> Manual
    DRAM CAS -> 9
    DRAM RAS to CAS -> 9
    DRAM RAS PRE Time -> 9
    DRAM RAS ACT Time -> 24
    -
    DRAM Timing Mode -> 2N
    -
    IMC Voltage -> 1.20v~1.25v
    DRAM Voltage -> 1.50v~1.55v

    If the problem persists then IMO update the BIOS to Version 1504 using ASUS EZ Flash 2:
    EZ Flash 2 is a built-in App to allow the BIOS to be upgraded and USB Flash Drive is the storage for the BIOS ROM file to be stored/accessed from with BIOS EZ Flash 2. The USB Flash drive must be formatted in FAT-32.

    Link -> http://vip.asus.com/forum/view.aspx?id=20070215223109668&board_id=1&model=P5B+Deluxe
    Video -> http://www.youtube.com/watch?v=NQKQj_aASCQ
  8. Yeah ive been using those slots will go check now... thanks
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