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Thread: i7 875k and memory multiplier




  1. #11
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    Default Re: i7 875k and memory multiplier

    Ahh I was thinking the 875k was a clark too. my mistake
    No I don't normally run 100fsb it was just for testing the 14x mem multi. and uncore is locked at 18x I'm afraid...
    yeah it's odd, the 4:28 divider, don't know why cpu-z does so...
    Last edited by Darkje; 10-10-2010 at 09:03 PM.
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  2. #12
    Chike is offline Senior Member
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    Default Re: i7 875k and memory multiplier

    Quote Originally Posted by Darkje View Post
    yeah it's odd, the 4:28 divider, don't know why cpu-z does so...
    I wonder too, but they may have tjeir reasons.
    CPU Tweaker will show x7.

  3. #13
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    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: i7 875k and memory multiplier

    I think it's more of a Gigabyte thing than CPU-z, because I know some other boards always show things like that and Gigabyte may or may not appear the same way for the same CPU on another board.

    Same with QPI, some boards used 16/22/24 for X58, while Gigabyte uses 32/44/48. Also same for P35/P45 memory multipliers in the BIOS, some use 1:1 for an example, some list the speed as a numerical value, and Gigabyte uses 2:00 for 1:1

    I guess everything can't be universal, otherwise we would never get confused and buy the wrong product, manufacturers don't want that to happen
    Last edited by Lsdmeasap; 10-10-2010 at 09:30 PM.

  4. #14
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    Default Re: i7 875k and memory multiplier

    Here is yet another person, pushing for Maximum memory freq. on lynnfield using x12
    GSkill DDR3 2000 CL6-9-6-24 1.65V (F3-16000CL6D-4GBPIS) and some tests - XtremeSystems Forums

    This guy is a legend, so it's not like he can't get 875K, many people see no reason and say 860/870 is fine enough, actually many of the great OC's would rather have these instead.

  5. #15
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    Default Re: i7 875k and memory multiplier

    I have no doubt that one cannot get to 14x on current Gigabyte or Asus boards. The fact that no one has been able to get to 14x means that their BIOS and software settings won't let them. These limits do not imply that the 875k does not have its memory multiplier unlocked.

    I have asked Ghostleader on OCN to see if the 14x multi actually works on his eVGA board. If not, then it doesn't work. If it does, then 14x is possible.

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  6. #16
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    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: i7 875k and memory multiplier

    Ya, you very well may be correct, we need some CPU-z validations to be 100% sure though.

    Since I have not seen any ever, nor heard of anyone using, I am leaning towards it's not possible on any board.

    I have been surprised a lot lately by the BIOS guys, so if you can get me some proof it's enabled I'll see what they can do to fix this for our BIOSes.

    I'm waiting to see some validations, then if we can get some I'm sure I can talk them into getting this changed for us. It may take some time though, it took 2-4 months for them to enable CAS 5 for X58, and longer to fix QPI Slow mode for X58 (Which works 100% now for Bloomfield CPU's BTW).

    So if it does work on other boards, I'm sure the BIOS team can enable on our Gigabyte boards but it may take a while is all.

  7. #17
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    Default Re: i7 875k and memory multiplier

    Quote Originally Posted by Lsdmeasap View Post
    Ya, you very well may be correct, we need some CPU-z validations to be 100% sure though.

    Since I have not seen any ever, nor heard of anyone using, I am leaning towards it's not possible on any board.

    I have been surprised a lot lately by the BIOS guys, so if you can get me some proof it's enabled I'll see what they can do to fix this for our BIOSes.

    I'm waiting to see some validations, then if we can get some I'm sure I can talk them into getting this changed for us. It may take some time though, it took 2-4 months for them to enable CAS 5 for X58, and longer to fix QPI Slow mode for X58 (Which works 100% now for Bloomfield CPU's BTW).

    So if it does work on other boards, I'm sure the BIOS team can enable on our Gigabyte boards but it may take a while is all.
    When I wrote to the Gigabyte support site and told them that the Asus BIOS allows for adjustable TB, I was told they don't do comparisons with competitors. Then unclewebb added adjustable TB to Real Temp. That shows it can be done in software, something they could add to ET6.

    I won't hold my breath waiting from the Gigabyte people to come up with the adjustable memory multiplier, even if it does exist. Real Temp has kept me from needing to buy an Asus board. But I still need a new motherboard. I'd like to stick with Gigabyte if I can. Their software people may be arrogant, but their hardware is top notch.

    And I don't want to have to increase my bclk. The whole point of using TB up to 30x is to be able to run cool. Real Temp allows me to do that.
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  8. #18
    Chike is offline Senior Member
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    Default Re: i7 875k and memory multiplier

    Maybe There's a good reason they don't implement nultiplier > 6.
    Intel's Core i7-875K and i5-655K processors - The Tech Report - Page 3
    Quote Originally Posted by AnandTech
    The version of the Asus BIOS we used for the bulk of our testing exposed memory clocks up to 1600MHz for the 875K and up to 1333MHz for the 655K. A later revision added 1600, 1866, and 2133MHz memory speeds with the 655K, though we weren't able to get the system stable at memory frequencies beyond 1600MHz in our few attempts with a couple of different fancy DIMM sets, even with loose memory timings and memory voltages over 1.65V.
    But memory performance is not everything there are others aspects
    Intel Processors with Unlocked Multiplier: Core i7-875K and Core i5-655K Review (page 4) - X-bit labs
    Better than our i3-540 for Overclocking?

  9. #19
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    Default Re: i7 875k and memory multiplier

    And, as a lagniappe, Ghostleader said:

    Yeah, sorry to break it to you, theyīre right, Lynnfield does only have x12 as max, I was wrong, sorry .

    I was looking in the wrong place in the bios, the picture showed different MCH straps, really donīt know what itīs but I think itīs some kind of ram performance enhancement, probably something like, higher value tighter subtiming .
    He then posted the DRAM frequency options, which maxed out at 2:12. (link)
    CPU: i7 4770k at 4.3GHz Vcore=1.19v Vccin=1.8v Uncore=4GHz Vrin=1.09v
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  10. #20
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    Default Re: i7 875k and memory multiplier

    you dont really need adjustable turbo boost imo,the power saving states do the same thing,they adjust the bclk/freq when idle and at load so whats the point in further turbo boost adjustment?
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