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Thread: [Update 1] Corsair GTX6, new world records: 3078 MHz CL8, 3060 CL7

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    [Update 1] Corsair GTX6, new world records: 3078 MHz CL8, 3060 CL7

    Lately there seems to be some rumble about the DDR3 CL8 world record, so I thought I am giving this one a try too. Fighting on my side are 2x1 GB Corsair Dominator GTX6 rated at 2625 MHz, 9-11-10-30, a pretty nice i7 870 ES  better than aIl of the retail chips 860/870 tested so far  and Besis memory freezer, which is definitely the reason why this could be working. Regarding the mainboard, I tried some boards in the last couple of weeks, but am still happy with my P55A-UD7. Does bclocks over 265+ and is quite comfortable. H55M-UD2H is too much pain in the ass.



    I started with CL8, same timings as marmott and Benji Tshi used on their 3068 MHz CL8 with Kingston T1 Go and went upwards from 200 bclock. Maximum bootable setting was 250 MHz bclock (ddr3 multi 12 = 3000 MHz), but temperature had to be around -90 and more °C for the memory and between -70 and -75 °C for the cpu (very close to its coldbug). From there it was easier to do the rest with SetFSB in little steps  add 1 MHz, wait a few seconds  VTT was 1.56 volts, VDIMM was 1.88, but I guess it could have been lower. I got to:

    World record CL8: 3078.2 MHz, CL8-11-8-31, 1T, tRFC 140, B2B CAS Delay disabled, Dual-Channel


    Link: http://valid.canardpc.com/show_oc.php?id=1374351

    I was also able to run SuperPI 1M at 3059.2 MHz! Other benchmark wont be a problem too  should have tried MaxxMem with a bit more frequency on the cpu. :p



    Well, that wasnt too hard to get, so I figured, that I should try to hit the bclock wall with CL10 with this precious 870. I tried whatever the IMC would love to throw overboard: Single-Channel, CL10-15-15-31  also played around with BCAS delay, but TaPaKaH/Sams result is unreachable (this time!). But I refused to give 1,7 volts VTT, like he did  1,62 was max  seems to make no difference on my chip.

    DDR3 memory clock, 2nd place: 3097.6 MHz, CL10-15-15-31, 2T, tRFC 140, B2B CAS Delay 30 (or so), Single-Channel


    Link: http://valid.canardpc.com/show_oc.php?id=1334974

    What should be mentioned is, that this result did not need any ln2 on the sticks (although I tried it as well). So I am still guessing pretty hard, that my cpu is limiting the results. Okay, CL10 got higher, but it seems like the IMC was just more relaxed by the loose timings and therefore allowed a slightly higher base clock. So next on my list was CL7 to really find out whats inside these heavily binned powerchips. I never tried CL7 before on those, so my expectations werent that high. I used the same settings as with CL8, just to know where Im at. I had to play around with the voltages a bit more  1.6 VTT, 1.94 VDIMM, 1.42 PCH and got it working to boot with 2880 (245*12) MHz. Now the sticks could really use the low temperature, so I had to go to about -115 °C. cpu was still near coldbug on -75 °C. I was pretty surprised when I had 3000 MHz CL7 running, SuperPI 1M stable. Here is what I finally got:

    World record CL7: 3059.4 MHz, CL7-11-8-31, 1T, tRFC 140, B2B CAS Delay disabled, Dual-Channel



    Link: http://valid.canardpc.com/show_oc.php?id=1374368
    And a nice 1M run with 3000 CL7, whatever thats really necessary for.



    For now its just a couple of useless frequencies and SuperPI times, but I will try to find some benchmarks, that can profit from these high bandwidths + low latencies. I guess I should crank up the cpu frequency too, maybe MaxxMem likes it, though we are on dual channel. Tweaking the subtimings or CL6 is also on my list  hell, theres a lot to do, so stay tuned!

    Here is the original thread on overclockers.at. Its in German, but adds a few images and infos: http://www.overclockers.at/extreme_c...fiziell_218663

    Update 1, 9/9/2010

    Hey guys, I just finished some tests with about 25 liters of ln2, so I have some results ready. But I still have to sort things out and for sure forgot a few comparisons, that would make things sweeter. Well, I need a few days more, but meanwhile I got for you the first part of my experiments:

    Everest


    CPU: 4900 MHz, memory: 2940 MHz CL8-11-9-24-90 1T


    CPU: 5000 MHz, memory: 3000 MHz CL8-11-9-24-90 1T


    Scales pretty well I guess. As I said, I didn't touch B2B Cas Delay, as it made no difference at all. Windows has a few issues with it, little bit like the R3E "slow mode" on the qpi setting.

    MaxxMem @ 4.8 GHz


    GTX2 @ Air, 2000 MHz CL7-7-7-18-74-1T, Score: 1466


    GTX6 @ LN2, 2880 MHz CL9-11-10-30-100-1T, Score: 1797


    GTX6 @ LN2, 2880 MHz CL8-11-10-30-100-1T, Score: 1837


    GTX6 @ LN2, 2880 MHz CL8-11-9-24-90-1T, Score: 1859


    MaxxMem likes high memory frequencies, so these results did not suprise me. Tweaking the subtimings had some effect too ... better be like that, because it's sooo time consuming . Please consider that the GTX2 was on air and not maxed out for frequency, but rather efficiency.

    SuperPI 1M @ 5 GHz


    GTX2 @ Air, 2092 MHz CL7-7-7-18-74 1T, time: 8.235 s


    GTX6 @ LN2, 2092 MHz CL7-9-8-24-90 1T, time: 8.235 s


    GTX6 @ LN2, 3012 MHz CL8-11-9-28-100 1T, time: 8.219 s


    Oookay ... not much to see here. 1M likes memory, altough it's not most important. But at these rates it just does not matter. But I guess 32M would scale much more. Ran out of the precious stuff, so yes ... next time!

    What is pretty interesting, is the fact, that timings can decrease performance. It seems like if one module is too weak, than the result goes back to single channel (even though it's shown otherwise in cpu-z). For example 1M at 2400 MHz with timings at CL7-8-8-24-74 1T was slower than CL9-10-9-30-134 1T. Altough CL7 is only possible under -90 °C and less.

    SuperPI 1M @ CPU: 4.8 GHz, memory: 2400 MHz


    GTX6 @ LN2, CL7-8-8-24 1T, time: 8.656 s


    GTX6 @ Air, CL9-10-9-30-134 1T, time: 8.594


    I also had the chance to shoot some new photos. Please view them here: http://www.overclockers.at/extreme_c...23#post3062423

    More to come very soon!
    Last edited by _mat_; 09-09-2010 at 02:22 PM.

  2. #2
    Banned M.Beier's Avatar
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    SWEET!!!
    More pictures!

  3. #3
    I am Xtreme Hornet331's Avatar
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    Nice one mat.

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    Registered User natu's Avatar
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    HI,

    holy moly.

    Very nice result

  5. #5
    Xtreme Owner FUGGER's Avatar
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    Knowing high B2B setting can produce useless results.

    Please run some bandwidth tests showing scaling.
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  6. #6
    Xtreme Enthusiast splmann's Avatar
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    Verry nice Result !!!

    I like the Memoryfreezer Build by besi my team member !!!


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  7. #7
    Xtreme Member marmott's Avatar
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    very nicely done, congrats !

    this CL7 frequency is impressive.

    we've tried maxmem at high frequency but it was crap

    we'll try to get another shot with Benji Tshi but we need a cpu with a better max bclk and a proper ram pot.

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    Quote Originally Posted by FUGGER View Post
    Knowing high B2B setting can produce useless results.

    Please run some bandwidth tests showing scaling.
    On CL10 I tried to get as high as possible, so I also fiddled around with the B2B CAS Delay. But it did not do much for max frequency, altough iirc the CL10-validation was taken with it. Not sure.

    CL7 and CL8 had B2B CAS disabled _for sure_. Next time I will include a screenshot with CPU-Tweaker too. I really wasn't prepared to get these results. :P

    Btw, why is this thread now in the Intel forums? Is not not extreme enough?

  9. #9
    Xtreme Mentor CryptiK's Avatar
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    Nice clocks. Maybe I'm a purist but with timings of CL10-15-15-31, it's just, a little bit weird. I also don't really consider CL7-11-8-31 'truly CL7' (although it is technically, I know), I think it gives a false impression of the situation once the timimgs other than CAS Latency get bloated beyond a certain point. These days it seems it's all about the raw MHz and not timings vs MHz and resultant performance.


    EDIT - I don't mean to sound harsh or detract from the MHz achievement. I'm just a little over these results where people claim a CL 'x' record with every other timing bloated out of proportion.

    As Fugger said, show some bandwidth scaling with these speeds and timings.
    Last edited by CryptiK; 09-05-2010 at 03:24 AM.
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  10. #10
    "AKA Alonso" Bluebeard's Avatar
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    Great results, Mat

    Keep on rockin´

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    Quote Originally Posted by CryptiK View Post
    Nice clocks. Maybe I'm a purist but with timings of CL10-15-15-31, it's just, a little bit weird. I also don't really consider CL7-11-8-31 'truly CL7' (although it is technically, I know), I think it gives a false impression of the situation once the timimgs other than CAS Latency get bloated beyond a certain point. These days it seems it's all about the raw MHz and not timings vs MHz and resultant performance.

    EDIT - I don't mean to sound harsh or detract from the MHz achievement. I'm just a little over these results where people claim a CL 'x' record with every other timing bloated out of proportion.

    As Fugger said, show some bandwidth scaling with these speeds and timings.
    Next chance is Tuesday, next week. I will update my post with screens including CPU-Tweaker then.

    Which bandwidth tests should be included? Will try MaxxMem, but without proper cpu frequency, there won't be much to show. Everest memory benchmark?

  12. #12
    I am Xtreme Hornet331's Avatar
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    I think everest should be a good start.

    Quick to do.

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    Xtreme Addict hicookie's Avatar
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    very impressive 3GHz CL7

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    Xtreme Member carpo93's Avatar
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    impressive
    sorry for my bad english
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    Sickness

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    Nice mat. It was a big pleasure to see the scores live. Well done. Next step is 3k on CL6^^

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    Xtreme Legend Turrican's Avatar
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    well done bro

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    Gongrats for the record.. Some spi32m maybe next time...
    Also, pretty awesome job by the memory freezer..


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    Xtreme Addict Tomasis's Avatar
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    what mem ic? not hyper? awesome oc
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    Xtreme Enthusiast sofos1990's Avatar
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    Stunning IMC

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    Thumbs up

    nice mat!

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    Registered User oxyyy's Avatar
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    Quote Originally Posted by Tomasis View Post
    what mem ic? not hyper? awesome oc
    iirc, Powerchip.

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  23. #23
    -100C Club Member Dualist's Avatar
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    Nice work Mat
    Quote Originally Posted by jimmyz View Post
    sorry to hear about the dead cards, but.. If stuff ain't dieing, you aren't trying.

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    Corsair Components, Inc. bachus_anonym's Avatar
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    Awesome CL8 and CL7 results, Mat! Congrats on your WRs and thanks for sharing what CMGTX6 is capable of, when pushed very hard!
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    Thumbs up



    great job, mat(e)!

    keep on pushing!
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