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Thread: [GA-P55-UD4] 4x2GB stability problem




  1. #41
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    Default Re: [GA-P55-UD4] 4x2GB stability problem

    OK, let me add something new to the discussion.
    This is my CPU: (no load)



    I read on the web my CPU has a "weak IMC".

    "Clarkdale base Core i3 and Core i5 CPUs. They tend to have a very weak IMC, and are often times not capable of running memory even at their stock speed. If you have a Clarkdale based CPU, you may have to sacrifice memory speed to attain a good CPU overclock."

    OK, i'm not overclocking, i know.

    "However, the integrated memory controller (IMC) is powered by the CPU VTT voltage. So under some circumstances, especially with the newer 32nm CPUs, you may not be stable with your memory even at stock speeds due to the overclock imposed on the IMC. This is particularly true if you are running 4 DIMMS (P55/H55/H57), 6 DIMMS (X58), or 4GB DIMMS (P55/H55/H57/X58). If this is the case keep the memory at stock speed, or even try dropping the memory clock multiplier to run at less than stock speed, and increase the CPU VTT voltage until you gain stability. The newer 32nm CPUs seem to have particularly weak IMCs, and often will not run at the higher multipliers even if your memory is perfectly capable."

    Source article here.

    So maybe i'm just running out of luck and have to be happy with 8GB @1066 MHz?

    Any thoughts on this?
    Last edited by compuser; 12-04-2010 at 09:19 PM. Reason: Pictures seem to get lost

  2. #42
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    Default Re: [GA-P55-UD4] 4x2GB stability problem

    I agree with the article, I purchased a 655K without knowing they had a weak IMC Compared to Lynnfield CPU's, so basically I bought it for nothing because it didn't even come close to what I was expecting to use it for (2500-3000+Mhz)

    So yes, those CPU's are not the greatest when it comes to memory, so you very well may need to downclock a little bit if you need to keep that much ram, or raise the QPI/Vtt more.

    You can use 1.35-1.5 easy, as long as you have good cooling. I think for 8GB @ 1333Mhz CAS 7 you should be ok with using 1.25-1.35, did you stop trying at 1.3?

    If you did try 1.35 and see if that helps, also increase PCH to 1.2-1.25 or so and see if that helps.

    What QPI speed are you setting?

  3. #43
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    Default Re: [GA-P55-UD4] 4x2GB stability problem

    Thx for your real life story!
    Yes, I stopped at 1.31V QPI/Vtt and my QPI speed is at stock setting.
    The M.I.T. Current Status tells me 6397.53 MHz (48x) and BCLK 133.28 MHz.

    BCLK and QPI Clock Ratio are on [Auto] setting.
    Lowering one of these settings is probably going to have more negative impact compared to running RAM at 1066 MHz, right?

    I have stock cooling so not the greatest, but silent!
    After increasing QPI/Vtt it doesn't seem to do much with CPU temps, so no cooling problem for bumping QPI/Vtt a bit.

    It doesn't feel comfortable running QPI/Vtt between 1.31 and 1.40 but maybe the sweet spot is there.
    Because this PC is pretty new and i need it on daily basis, i don't want to risk/trash my CPU.

    Funny thing is my setup is now running stable at QPI/Vtt only 1.10V !! (Only RAM at 1066 MHz.)
    Last edited by compuser; 12-03-2010 at 02:24 PM.

  4. #44
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    Default Re: [GA-P55-UD4] 4x2GB stability problem

    You may just need to use 1.35-1.4 QPI/Vtt, when I do use my 655K and run high memory speeds I often use that or more, so that may be all you need with 8GB.

    QPI ratio is what I was wondering about, you should set that yourself manually, but looks like auto may be ok if it's keeping it around 6.2-7.4

    You should probably get a better cooler sometime when you can, but if temps remain good then you will be fine using 1.3-1.4

  5. #45
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    Default Re: [GA-P55-UD4] 4x2GB stability problem

    QPI Clock Ratio is now set manually at 48x.
    How can [Auto] setting for QPI Clock Ratio become a problem?
    I guess only if BCLK > 133 MHz right?

    If i get a better cooler maybe i try 1.3-1.4 QPI/Vtt range.

  6. #46
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    Default Re: [GA-P55-UD4] 4x2GB stability problem

    Mine will go from 48x to 44x on auto at Bclk 192/193 if I remember right... currently at 207Bclk w 44x (actually 22x in cpu-z, so 44 is kind of like ddr rating I suppose) ...

    With 2 sticks and 1.3VTT it's fine at that bclk, and the 1333-c9-1.5v sticks running at 1650someting-c8-1.66v.
    - Z68X-UD3H-B3(rev 1.3), bios F12
    - I5-2500k [3148C059], cooled by scythe mugen2 rev.b with 1500rpm pwm-fan on cpufan header.
    - 8G(2x4G) Corsair Vengeance LP CML8GX3M2A1600C9W,Low profile/Low voltage, DDR1600/C9-1.35v. Slots 1&2.
    - 16G(4x4G) Samsung M378B5273DH0-CH9 1333 @ 2133-c11. w1.55v

    - Seasonic M12D SS850-EM , 850W Semi-Modular PSU with 80A at 12V.
    - 2x EVGA GeForce GTX285-1GB in SLi, 4x 6pin power and bridge connected.[PCIEX_16 and PCIEX_8]
    - Hauppauge HVR2200 PCIE 1x tv-tuner card.[PCIEX1_3]
    - Intel controller in raid mode.
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    - 1x WD 1000G black on intel port 2.
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    - 24" LCD monitor @ Geforce 0, lower HDMI port.
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    - 19" LCD tv @ intel/onboard HDMI.
    - 4ch analoge speakers, cambridge dtt set.
    - internal spdif header connected to Geforce 0.
    - front usb connected.
    - front ac97 connected.
    - front cardreader (usb) connected.
    - rear 4x usb bracket.
    - ms media keyboard, ms comfort mouse. usb, wired.
    - w7x64-sp1.



  7. #47
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    Default Re: [GA-P55-UD4] 4x2GB stability problem

    Quote Originally Posted by compuser View Post
    QPI Clock Ratio is now set manually at 48x.
    How can [Auto] setting for QPI Clock Ratio become a problem?
    I guess only if BCLK > 133 MHz right?

    If i get a better cooler maybe i try 1.3-1.4 QPI/Vtt range.
    what cooler do you have ? qpi/vtt voltage shouldnt raise temps that much,not compared to cpu voltage
    Gigabyte z77x UP4-TH F11c Modded Bios
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  8. #48
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    Default Re: [GA-P55-UD4] 4x2GB stability problem

    Thx gents, I understand it takes a long time for [Auto] to drop on QPI Clock Ratio.
    Currently I'm using the stock cooler supplied with my boxed Intel i5-650 CPU.

    Browsing this forum you run in all kinds of nice freeware tools.
    So I made some pics of measuring the difference in RAM speed on my PC.

    1333 MHz:

    Last edited by compuser; 12-04-2010 at 09:11 PM. Reason: Pictures seem to get lost

  9. #49
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    Default Re: [GA-P55-UD4] 4x2GB stability problem

    1066 MHz:



    Close call because of the tighter (SPD) timings i guess.
    Reading from RAM suffers the most, about 7%.
    Last edited by compuser; 12-04-2010 at 09:14 PM. Reason: Pictures seem to get lost

  10. #50
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    Default Re: [GA-P55-UD4] 4x2GB stability problem

    Well don't worry too much about it, even when it is slower with the 8gb compared to 4gb, it will always be much faster than pagefile usage, even if it's on a ssd, so if you really need the extra 4gb mem it's a trade off you have to concider, I guess.

    I like benchies too so I tried maxxmem2 to compare:
    - Z68X-UD3H-B3(rev 1.3), bios F12
    - I5-2500k [3148C059], cooled by scythe mugen2 rev.b with 1500rpm pwm-fan on cpufan header.
    - 8G(2x4G) Corsair Vengeance LP CML8GX3M2A1600C9W,Low profile/Low voltage, DDR1600/C9-1.35v. Slots 1&2.
    - 16G(4x4G) Samsung M378B5273DH0-CH9 1333 @ 2133-c11. w1.55v

    - Seasonic M12D SS850-EM , 850W Semi-Modular PSU with 80A at 12V.
    - 2x EVGA GeForce GTX285-1GB in SLi, 4x 6pin power and bridge connected.[PCIEX_16 and PCIEX_8]
    - Hauppauge HVR2200 PCIE 1x tv-tuner card.[PCIEX1_3]
    - Intel controller in raid mode.
    - 2x WD 500G blacks in raid0 on intel port 0-1.
    - 1x WD 1000G black on intel port 2.
    - 1x OCZ Vertex2 (32nm) on intel port 3.
    - 1x Optiarc DVDRW on intel port 4.
    - 1x Samsung 500G on marvell port 0.
    - 24" LCD monitor @ Geforce 0, lower HDMI port.
    - 17" LCD monitor @ Geforce 0, upper HDMI port.
    - 19" LCD tv @ intel/onboard HDMI.
    - 4ch analoge speakers, cambridge dtt set.
    - internal spdif header connected to Geforce 0.
    - front usb connected.
    - front ac97 connected.
    - front cardreader (usb) connected.
    - rear 4x usb bracket.
    - ms media keyboard, ms comfort mouse. usb, wired.
    - w7x64-sp1.



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