Installed 6GB ran, but I'm only seeing 4GB...

Hi, I recently built my own computer with 6GB RAM running Windows 7 64 bit, however control panel is saying I have 4GB installed. I also ran msconfig and under advanced options under the Boot tab, the maximum memory won't let me push it passed 4096. Below are the relevant specs for my computer. Thank you in advance!

MOBO - ASUS P7P55 LX
RAM - Obsidian DDR3 1600 (3 @ 2GB)
Graphics Card - Radeon 5770
Processor - Core i5
10 answers Last reply
More about installed
  1. To my understanding, that MoBo / i5 supports 2 channel memory (RAM installed in multiples of 2) .... you have a 3 channel kit (RAM installed in multiples of 3)
  2. Ah, so with my current settings I'd have to throw in another 2GB card then I can max out at 8GB?
  3. No, 3 sticks should still be recognized, even if its inefficent.

    How much does the BIOS recognize?
  4. Open CPU-Z and make sure it shows all 6GB....
  5. I ran CPU-Z and its reading all three RAM pieces. Under the Memory tab it has 6144 MBytes for Size adn under the SPD tab I'm seeing Ram for Slot 1, 2, and 3. Thoughts?
  6. Your system is running 6GB ATM, but it looks like it is not in dual channel mode. Not sure if it is the same as AM3 systems but you can run dual channel with either 4 or 8GB on RAM. The P55 support dual channel only meaning a user will normally buy a set of 2x 2Gb or 4x 2Gb DDR3. The 3x 2Gb and 6x 2Gb sets are normally used with the x58 platform. Your best option here is to buy a single stick for a total of 8Gb.
  7. Ok. So for now would you suggest removing a RAM card to optimize efficiency?
  8. Try this, remove the third module, test your PC with a benchmark like Sandra, Vantage or PCmark. Then install the third module and test again... Compare marks and you should have your answer.
  9. I JUST BUILT A NEW SYSTEM TO I7 960 ON X58A-UD7 GIGABYTE MOTHERBOARD AND 6GIG OF OCZ TRIPLE CHANNEL RAM AND ON WIN 7 64 BIT OS AND IN THE SYSTEM TAB IT SAYS 6GIGTOTAL BUT ONLY [4GIG USEABLE ] WTF !!! THE OTHER 2048 MB IS RESERVED FOR HARDWARE ?
  10. I have the following hardware

    intel core i7-920
    Gigabyte x58A-UD3R motherboard
    6gb of OCZ DDR3 1600mhz ram

    and I'm running Windows 7 64 bit.

    I was experiencing this same issue. If I ran the ram at 1600mhz, I could only see 4gb, but if I ran it at 1066mhz I could see all 6gb. I noticed that in my bios settings, the DRAM voltage was auto set to 1.5V. After upping it to 1.6V, I am able to run my ram at 1600mhz and see all 6gb seemingly with no problem.

    Hope this helps.
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