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Thread: i7 875k and memory multiplier




  1. #1
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    Default i7 875k and memory multiplier

    I have an i7 875k. It has unlocked multipliers. With Real Temp I can get a Turbo Boost to 30x, so my cpu clock on load is 4020MHz.

    I would like to be able to use a memory multiplier of 14x. Apparently it can be done: check out this thread.

    Any thoughts? Comments?
    CPU: i7 4770k at 4.3GHz Vcore=1.19v Vccin=1.8v Uncore=4GHz Vrin=1.09v
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  2. #2
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: i7 875k and memory multiplier

    Lynnfield only supports x12 memory multiplier, maybe in that image he is using Clarkdale and we can't tell?

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    Default Re: i7 875k and memory multiplier

    Quote Originally Posted by Lsdmeasap View Post
    Lynnfield only supports x12 memory multiplier, maybe in that image he is using Clarkdale and we can't tell?
    But Intel's promo materials show the memory multiplier as also being unlocked.
    CPU: i7 4770k at 4.3GHz Vcore=1.19v Vccin=1.8v Uncore=4GHz Vrin=1.09v
    MB: Gigabyte GA-Z87X-UD4H (Rev 1) F9
    Heatsink: Prolimatech Armageddon with 2 NF-A14's, Gelid GC Extreme TIM
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    SSD: Samsung 840 Pro 512GB; HD's: WD Black 4TB, WD Red 3TB
    PSU: Seasonic X-750; CM N600 case Trophy Run: 5GHz

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    Default Re: i7 875k and memory multiplier

    Show me what you are looking at, I have 875K and it only has x12 multi too.

    Clarkdale has many memory multipliers, but the IMC is terrible in comparison to Lynnfield

  5. #5
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    Default Re: i7 875k and memory multiplier

    This should also help assure you that x12 is the highest Lynnfield can do, many people pushing 3000Mhz+ memory speeds are always using x12 on Lynnfield as that is the only option evem with 875K.

    Latest one I see today is this one, but this is 860
    G.SKILL 2500 @ +3100 Cl9 Dual Channel 2 X 2GB Sticks - XtremeSystems Forums

    The original 8xx CPU's were going to be locked at 6/8/10 for the memory mutlipliers, and I think that may be where the "Unlocked Memory" part of Intel's information you are seeing may come from, since the K series offers x12 over the original limit of x10

    I do see your discussion at OCN, can you see if ghostleader will post some CPU-z validations using the x14 memory multiplier so we can see if it actually is working or not. If it indeed is then I can send in a request to Gigabyte and see if they will look into this.
    Last edited by Lsdmeasap; 10-10-2010 at 04:45 PM.

  6. #6
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    Default Re: i7 875k and memory multiplier

    With my 655K I can pick 6-8-10-12-14-16 and 18x mem multipliers in the bios on this p55-ud4 (never actually tried higher than 10) ... covering such a range that you won't run out of multi's soon... at 134fsb it seems to range from ddr800 up to ddr2400.

    Now you got me wandering if 14x will work ... I'll go try and report back later :)

    edit: yes 14x mem multi is working! Image showing cpu-z with mem running at 14x and pic of bios mem multi options (still set at the 8x I normally use).

    Last edited by Darkje; 10-10-2010 at 06:19 PM.
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  7. #7
    Chike is offline Senior Member
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    Default Re: i7 875k and memory multiplier

    You normally use 100MHzFSB?
    What about the uncore is it unlocked too?

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    Default Re: i7 875k and memory multiplier

    @ Darkje

    That's a Clarkdale CPU, not Lynnfield, the OP was asking about Lynnfield CPU's which have a limit of x12. The Clarkdale CPU's have a much different IMC, and it's normal to have all those memory multi's, and yes they all will work.

    Uncore is locked on all 1156 CPU's, some at different amounts though.

    x14+ always works on 655K

    Cause I'm bored and sleepin.....

    6.03Ghz Memory @ 2080Mhz 7-8-7-24
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    5.77Ghz Memory @ 2140Mhz 8-9-8-24
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    @ ehume

    What you should do is just overclock, instead of using 133 bclk, then you could have much faster memory since that is what you are after anyway
    Last edited by Lsdmeasap; 10-10-2010 at 08:21 PM. Reason: Edited out my tiredness :)

  9. #9
    Chike is offline Senior Member
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    Default Re: i7 875k and memory multiplier

    Well those are unlocked CPUs arebn't they?

    And btw x14 is 4:28... last time I 've checked my watch (somewhere back in the early 90s)

  10. #10
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    Default Re: i7 875k and memory multiplier

    Haha, ya it could be, not sure I'm probably asleep at the wheel again I'll edit that now.

    I just noticed it said 4:20 in my CPU-z validations so thought I'd post em up and see how you guys like my OC's. I guess you are right I'm sleep posting again.... those are w/ x10.

    Ya, 875K and 655K are both unlocked CPU's, Lynnfield and Clarkdale respectively.

    Wonder why CPU-z shows in 4:x format for 655K, but 2:x format for 875k?
    http://valid.canardpc.com/show_oc.php?id=1349202

    http://valid.canardpc.com/show_oc.php?id=1346836
    Last edited by Lsdmeasap; 10-10-2010 at 08:23 PM.

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