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Thread: How fast should my memory go?

  1. #1
    Senior Member AD-15's Avatar
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    How fast should my memory go?

    hello,

    I'm using 2 pairs of this memory:

    http://www.corsair.com/_datasheets/T...48-8500C5D.pdf

    As I'm using 4 sticks, I'm forced to run it at 900MHz at 5-5-5-15 2T to keep it stable. However, after asking on the hardware forum here, I've been told that this high-end memory should be able to run at 1066 using the CAS 5 latencies no problem, even using 4 sticks. Why can't I do this?

    Thanks!


    P.S: Here's the thread if you want to have a look at it

    http://forums.hexus.net/hexus-hardwa...em-stable.html
    Industrial espionage is simply the sincerest form of flattery......

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    Registered User Yellowbeard's Avatar
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    Re: How fast should my memory go?

    You are not necessarily going to be able to achieve the 1066 speed with 4 modules due to the limits of the memory controller. You will need to increase the voltage to the memory controller to have any chance of getting 4 up to run 1066.

    AN806 has more detailed information.

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    Senior Member AD-15's Avatar
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    Re: How fast should my memory go?

    hello,

    I've tried raising it to 1.44V but this has no effect.
    Industrial espionage is simply the sincerest form of flattery......

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    mutantbass head Lee H's Avatar
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    Re: How fast should my memory go?

    As taken from the PDF

    Many users interpret these specifications too liberally. A motherboard that can overclock to a given speed with 2 modules cannot overclock to that same given speed with 4-up. Again, this is due to the increased electrical load on the north bridge or memory controller and the increased heat that accompanies it. So, many users are disappointed when they add memory and their overclocking capability is reduced. They tend to fault the memory for this limitation when it is actually a physical limitation of the memory controller.
    A good analogy representing visualization of the above specifications is a passenger truck. Let‟s assume that the maximum hauling capacity of the truck is 8000 pounds representing 8GB of memory. The top speed of the truck is 106.6 mph representing a memory speed of DDR1066. However, this does not mean that the truck can haul 8000 pounds at 106.6mph. The physical limitations are similar for a memory controller as 8GB and 1066 are both tested maximums for this memory controller. When the memory controller speed is increased for overclocking, it simply cannot manage the same amount of memory at that overclocked speed for proper stable communication with the CPU.
    Maybe this is why it will not reach the higher speed with 4 x modules inserted?

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    Registered User Yellowbeard's Avatar
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    Re: How fast should my memory go?

    Thanks Lee, that's exactly the portion I was referring to.

    How's the laser chasing coming along?

  6. #6
    Senior Member AD-15's Avatar
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    • AD-15's system
      • Motherboard:
      • Asus Rampage II Extreme
      • CPU:
      • i7 920 @4.45GHz!!!! (No HT)
      • Memory:
      • 3x2GB G.Skill Trident
      • Storage:
      • 1x 160, 1x 250 (Both 16MB cache SATA2 WD)
      • Graphics card(s):
      • EVGA 460 1GB @ 815, 1013MHz
      • PSU:
      • 850W Corsair HX Series Modular
      • Case:
      • Corsair 700D
      • Operating System:
      • Windows 7 64
      • Monitor(s):
      • 22" Dell E228WFP

    Re: How fast should my memory go?

    hello,

    Ah, sorry, I didn't see the link.

    However, I already new about the MCH limitations. The reason I asked is because other people have no problems running 4 sticks at the maximum rated speeds. Why is this?
    Industrial espionage is simply the sincerest form of flattery......

  7. #7
    Registered User Yellowbeard's Avatar
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    Re: How fast should my memory go?

    Some boards will, some boards won't. Are you saying that others with the same board as you are able to do it or, are they using different MOBOs?

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