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Thread: i7 Overclocking Issues with EX58-UD5




  1. #21
    flyfisher is offline Member
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    Default Re: i7 Overclocking Issues with EX58-UD5

    Although all chips are different, with my 920 I found that when using the 8x memory multiplier, using the 17x uncore mutliplier was much more stable than 16x. No extra IOH, MCH or QPI PLL required.

  2. #22
    Join Date
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    Default Re: i7 Overclocking Issues with EX58-UD5

    Well, I hope I may have found my problem. I went in and manually set nearly every memory setting I could, following the XMP profile for 1600 MHz on my ram. Have yet to run Large FFT, but gonna do that in a bit once LinX finishes.

    Anyone else have to do the same thing with their memory in order to get it stable?

    Also, thanks for the replies.
    Quote Originally Posted by Higgins
    Pro tip: don't piss off PC gamers on purpose

  3. #23
    Join Date
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    Default Re: i7 Overclocking Issues with EX58-UD5

    Something that I posted over on the Corsair forums... just seems like its ****ty ram that cant get to 1600MHz. A lot of people have been having the same issue with the RAM at or around 1600MHz with the RAM that I have. Some say its a bad IMC, but I highly doubt it.

    This is what I posted.

    Im in the same boat dude. Im gonna jump in on this thread to see if we can get this worked out.

    Firstly, I have the same motherboard as you. My i7 920 is a D0 stepping, but I dont have it at stock. Ive been trying to overclock it, but run into problems past 3.8GHz and I think its the RAM.

    At 3.8GHz, I have 181 BCLK, 21x CPU multiplier (w/ Turbo and HT), 8x memory multiplier (puts the memory at 1448MHz), 16x uncore frequency, 36x QPI link speed, and voltages of 1.21250v vCore, 1.66v vDIMM) and 1.175v QPI/VTT voltage in BIOS. Every other voltage was set to auto.

    Manual timings of 8-8-8-24-2T were entered for the RAM.



    Anything above 3.8GHz just starts to have problems. I could run LinX and Prime 95 blend/small FFT all day and not have any problem, but when I run Prime 95 Large FFT, the computer just takes a dump (either freezes or reboots).

    At 191 BCLK (4.01GHz) and 1.28750v vcore, I cant find any QPI/VTT voltage that works. Ive tried just about everything from 1.155v to 1.415v QPI/VTT voltage. At the moment, anything above 1.215v QPI/VTT voltage causes the computer to reboot (like the reset button was pressed) while stressing using Prime 95 Large FFT.

    1.175v and 1.195v QPI/VTT voltage cause the computer to freeze during Large FFT stressing and the LED code on the motherboard to change from FF to C0 which apparently means "CPU status flag test, CPU register test, memory refresh test" according to an LED code guide I found. 1.125v QPI/VTT voltage leads to the system freezing completely and the LED code does not change.

    I had all other RAM settings on auto, but I changes almost everything manually according to settings from the XMP profile, but that did not help either. I also have change the auto voltages to manual, with IOH Core at 1.12v, ICH Core at 1.14v, QPI PLL at 1.14v, CPU PLL at 1.8v (Normal), and the rest on "Normal" settings.

    Hopefully we can get to the bottom of this. Its keeping me from a stable OC at 4.0GHz, and I was going to try for 4.2GHz :/
    Quote Originally Posted by Higgins
    Pro tip: don't piss off PC gamers on purpose

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