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Thread: I7 uncore/dram rule




  1. #1
    Acebmxer's Avatar
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    Default I7 uncore/dram rule

    I know for the i7-920-975 cpus uncore must be 2x memory mutli and the 980x and the 970 only need 1.5x memory multi.

    My question is why? what happens if you run lower then 2 x memory multi (920-975) or less then 1.5 x memory multi (970-980x).

    If you have a link to a site that can explain this please post it here.
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  2. #2
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    Default Re: I7 uncore/dram rule

    Lower than will not boot, it's that easy :)

    Although I have not tried it with massive voltages or anything, so it might, but I doubt it as I have tried with normal or reasonable voltages.

  3. #3
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    Default Re: I7 uncore/dram rule

    you are correct once again :)

    I thought i was able to with my 930 before i knew but I must have been mistaken b/c i just tried and it would not boot at 15x uncore 8x memory. but will at 18x uncore 8x memory. both at 215 blck.
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    Default Re: I7 uncore/dram rule

    Ya, I've tried it at 133Bclk with low multi's and it doesn't work at all.

    It might if you super over-volt things, but I doubt it.

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    Default Re: I7 uncore/dram rule

    I have the 980x and before I knew about the 1.5 X System Memory Multi rule I was running it at x17 uncore/Mem Multi @10. I scored my highest Memory score and Lowest latency but was not stable. Memory Score:14.64GB/sec - Latency 46.6ns. (24GB's@2000) My question is: What damage am I doing to my MOBO, CPU, or RAM ???
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    Default Re: I7 uncore/dram rule

    That is fine, it wont hurt anything.

    Anyway at x10 memory multi your min. would be x15 and then 20+ would be max, so you are in the middle anyhow so you are fine.

    I use x22 uncore most of the time when using x10 memory multi on 980X.

    24GB @ 2000 is great!! What timings did you have set, and this is the memory in your sig?

  7. #7
    Acebmxer's Avatar
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    Default Re: I7 uncore/dram rule

    So there is a upper limit also or just how crazzy you feel adding qpi/vtt voltage?
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  8. #8
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    Default Re: I7 uncore/dram rule

    This is where I have found the limit of my overclocking to come from.

    The CPU Uncore Frequency can not run at 4000mHz so I can not run my memory which is rated at 2000Mhz at 2000Mhz.

    My cpu I have tested up to 4.2Ghz but in the end I am only running it at 3.87 using a BLK of 155.

    I am also confused as I read that a lot of people recommend setting the Uncore clock ratio to that of the CPU ratio +1. How can you achieve clock speeds of greater than 4 ghz if Uncore is maxed out at 3950Mhz.

    If anyone has any other suggestions of combination's to get better performance out of my setup please advise.
    Last edited by shadow6491; 11-03-2010 at 01:57 PM.

  9. #9
    Acebmxer's Avatar
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    Default Re: I7 uncore/dram rule

    what cpu are you using? If your ruinning a 920-975 i7 then thats about average . my 930 has a weak imc and needs some volts. My 920 and run 2000 ram at 200 blck and decent voltage but not suitable for 24/7 imho. I havent read any where about uncore ratio to cpu ratio. I heard people saying they have to keep their uncore faster then their qpi speed. I dont have that problem.
    Main Rig
    Gigabyte z87x-OC
    Haswell i7 4770k - 4.7Ghz @ 1.330v LLC Extreme (L310B492)
    G.Skill F3-1700CL9D-8GBXM DDR3-2133mhz 9-11-10-28 1.65v @ 2800mhz 12-14-14-35 1.7v
    Samsung Green 8GB 2x4GB MV-3V4G3D/US DDR3 1.3v 30nn @ 2200Mhz 11-11-11-32 1.60v
    Sapphire ATI HD 7970 3GB clocked 1200MHz @ 1.181v.
    HiS ATI HD 6950
    Samsung 840 Pro 256GB SSD (boot Drive) on Intel sata3 controller port0
    Corsair Force GT 120 GB Sata3 SSD on Intel sata3 controller port1
    Samsung 320GB HD322GJ 7200 RPM 16M cache on Intel sata3 controller port2
    Sony Optiarc DVD-RW AD-7240S on Intel sata3 controller port5
    CORSAIR CMPSU-850TX PSU
    Swiftech MCP655-B Pump
    EK Supremacy Cpu Block
    Swiftech Mcres Micro Rev 2 Reservoir
    Black Ice GTX Xtreme 360 Radiator





  10. #10
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    Default Re: I7 uncore/dram rule

    I made up this table in excel to try and compare the different blk freq with that of Uncore and memory freq and the resulting CPU speed.

    I tried to post the table here but got message to long.
    I found some very interesting results that I just could not explain for example a blk of 155 memory multiplier of 12 a uncore multipler of 25 and cpu at 25 should be the same as
    a blk of 186 a memory multiplier of 10 an uncore of 20 and a cpu of 21 or 22 but it doesnt

    But then when I go back and test my previous stable settings I get bluw screns of death as well. I can see why some people would like a little help in this area.

    Some of the answers are a real cop out. actually those are more over in the corsair forum.

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