Yet another, missing memory question...

Hey everyone!

So I recently got a new ram stick due to the fact that my computer would not start anymore. I removed one of the ram sticks, and bam computer loaded.

I'm running windows 7 home premium, service pack 1, 64-bit OS. My mobo is an Asus P5KC, and my CPU is an Intel E8400 dual core 3 GHZ.

Now, here is the problem... I've installed a brand new Kingston DDR3 HyperX Blu 8GB (4/4) ram stick, 1.50v. I have a 2gb stick (Kingston DDR3 I'm not sure what model...) Installed already.

I've run CPU-Z and it has detected in the SPD tab that there is indeed two sticks of ram installed. However, when I go to the basic information (start menu>(right click) computer (properties)>system) it shows only 2gb installed memory.

I've then gone to the BIOS and it shows only 1 installed stick. Even in post, it says "DDR3 Single Channel," or something to that effect. I then updated my bios, and the same result.

Then I've run memtest86, and it recognized both ram sticks are installed, however when I had an option to view my ram sticks in the configuration menu, it showed only the DDR3 2gb ram. I ran through the test, and it said they passed.

After that, I've checked my BIOS for any setting that I could find for memory, or overclocking to manually set the timer for the ram, however there was nothing. So I took out the 2GB ram, and booted the computer, but it just went to black screen, with NO mobo beeps. I switched the ram around, and the computer is still only detecting 2gb.

Even if the ram was faulty, would CPU-Z and MemTest86 still detect them? Can my mobo just not accommodate this ram? What is going on here!?
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  1. Best answer
    Yes this is right behavior of the mobo because your mobo supports DDR3 1066MHz (1333 OC) upto 4GB Max, whereas you are using 8GB DDR3 which will not work with this mobo. It is the mobo's limitation.

    Check this out:

    [2 x DIMM, Max. 4 GB, DDR3 1333(O.C.)/1066/800 Non-ECC,Un-buffered Memory
    Dual Channel memory architecture
    4 x DIMM, max. 8GB, DDR2 1066*/800 / 667 MHz, non-ECC, un-buffered memory
    Dual channel memory architecture
    *The chipset officially supports the memory frequency up to DDR3 1066MHz/DDR2 800. Due to the tuning by ASUS exclusive technology, this motherboard natively supports up to DDR3 1333/DDR2 1066MHz. Please refer to or user manual for Memory QVL]

    This is from your mobo's specs on the manufacturer's website.
  2. D'oh!

    That would make sense! Ha! It's an old mobo... it was from my old computer (my other recent mobo went kaput!)

    Thanks guys! Out to buy another 2gb ram stick!
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