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Thread: i7 920 D0 Stepping OverClock review

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    Default i7 920 D0 Stepping OverClock review

    I've been reading quite a number of reports about D0's excellent overclockability so what happens next?
    I went out to buy one for myself and i would like to share some results and comparative performance figures against the older C0 steppings

    Here's a initial test of the D0's overclockability (attached photo)

    On my C0 stepping i reached 4.2ghz with 1.425vcore and had to disable HyperThreading in order to get my system stable, no matter what i did i could never enable HT and successfully boot in to Windows without a BSOD or Hard Lockup

    With the D0 i fired up my system, and during POST Rampage BIOS prompted "Pls update your BIOS to unleash full performance of your CPU" (sounds kinda Welcoming huh?)
    so i updated my BIOS from 0903 to 1306

    With the new BIOS flashed all previous settings were erased and i had to start all over again. Due to my time constraint as it was pretty late

    I did the following:
    1. dial in 200 Bclk for 4.2ghz
    2. Set multiplier to x21 (Yes BIOS 1306 allows you to dial in x21 multi)
    3. turbo Mode On
    4. HyperThreading on
    5. Disable PowerSaving Features
    6. Set RAMs to 1603mhz
    7. Vcore to 1.28
    8. Everything Else left on Auto
    9. Enable Loadline Calibration

    Carried out the 1st test of running Intel Burn Test.

    Stay tuned
    for more updates

    Last edited by bullydog; 15-05-2009 at 23:42.

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    Strange on 4.4ghz it passed Intel burn test with x21 multiplier with 1.35vcore but on 8 threads of prime the multiplier refuses to go to x21 it just stays on x20 multiplier any clue?

    Tried changing BIOS settings of CPU Ratio to Auto or x21
    all power saving features disabled

    temps are: 76-74-75-71

    EDIT: Need to Disable in BIOS "CPU Turbo Limit" in order to Force x21 Multiplier
    Last edited by bullydog; 18-05-2009 at 09:26.

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    no further updates ... heat output beyond 200 bclk is way too high
    load temps on LinX is approximately 81c

    I am not risking it any further
    Last edited by bullydog; 20-05-2009 at 09:12.

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    Final clock speed will be 200bclk on 1.27 vcore
    cheers and thanks for viewing
    Last edited by bullydog; 20-05-2009 at 09:13.

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    Bully my friend, spending more money huh?
    Something wrong...still can get the HT on with the C0 version? This vesion suppose to give you lesser Vcore but you have 1.28v at 200 blck x21 multi. That is pretty low.

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    Quote Originally Posted by Deton View Post
    Bully my friend, spending more money huh?
    Something wrong...still can get the HT on with the C0 version? This vesion suppose to give you lesser Vcore but you have 1.28v at 200 blck x21 multi. That is pretty low.
    Someone wanted to buy my C0 i7 and well i was thinking why not take the chance to give the D0 a try if it was well worth all the talk about

    Yeah i couldn't get HT turned on with turbo mode enabled on my C0 maybe it might work on 3.9ghz but i refuse to settle with 3.9ghz on my i7.

    With this D0, it was easy, 200bclk x 21 multi = 4.2ghz and all it needed was 1.28vcore. If i have the chance i will give it a try who knows this D0 might only need 1.25vcore to boot at 4.2ghz with HT turned on

    Over the next few days hopefully i will find some time to push it further... and see how far i can go with this D0 Chip
    Last edited by bullydog; 16-05-2009 at 10:39.

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    Quote Originally Posted by bullydog View Post
    .....

    Yeah i couldn't get HT turned on with turbo mode enabled on my C0 maybe it might work on 3.9ghz but i refuse to settle with 3.9ghz on my i7.
    U gotta get HT to work.....I refuse to turn it off with i7.
    Turbo doesn't mean much when you can highly OC it manually.

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    Quote Originally Posted by Deton View Post
    U gotta get HT to work.....I refuse to turn it off with i7.
    I've sold the C0 already deton
    HT is turned on with my D0 now though

    Now that i have HT Turned on ... the temp difference are really significant in terms of heat output
    about an overall 1c-2c increase

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    Deton can you verify this?
    i set my AI overclock to XMP profile. When i dial in my Bclk to 210 my Ram Speed options are
    1200+mhz and 1683mhz etc...

    I could be wrong here my assumption on XMP is that XMP profile is supposed to keep the Memory Speeds at DDR3-1603mhz regardless of the Bclk speed?

    if i've set XMP profile and as i increase my Bclk to 210 and Ram increases then my Rams could be holding me back i will need to buy 1866mhz or 2000mhz Memory :confused:

    Thanks in advance

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    Quote Originally Posted by bullydog View Post
    I've sold the C0 already deton
    HT is turned on with my D0 now though

    Now that i have HT Turned on ... the temp difference are really significant in terms of heat output
    about an overall 1c-2c increase
    Ok...I thought you still have a problem with D0.

    Quote Originally Posted by bullydog View Post
    Deton can you verify this?
    i set my AI overclock to XMP profile. When i dial in my Bclk to 210 my Ram Speed options are
    1200+mhz and 1683mhz etc...

    I could be wrong here my assumption on XMP is that XMP profile is supposed to keep the Memory Speeds at DDR3-1603mhz regardless of the Bclk speed?

    if i've set XMP profile and as i increase my Bclk to 210 and Ram increases then my Rams could be holding me back i will need to buy 1866mhz or 2000mhz Memory :confused:

    Thanks in advance
    I think your theory is right about XMP. You might have to tinkering your RAM manually to get it go higher.

    On the second thought you are might better buy a faster ram to save you time. It is very time consuming to get these triple channel OCing.

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    Quote Originally Posted by Deton View Post
    I think your theory is right about XMP. You might have to tinkering your RAM manually to get it go higher.

    On the second thought you are might better buy a faster ram to save you time. It is very time consuming to get these triple channel OCing.
    does your P6T BIOS have the built in Ram Calculator?
    Can you try to dial in 210bclk on your P6T BIOS and see if Ram speed increase even with XMP profile set?

    Thanks in Advance

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    yes it does.
    RAM speed changes but not the timming therefore you can't use it. You have to manually tweaking it. This is going to take some time.

    I have no problem to get XMP boot at 209 Bclock but I have a hard time to get it pass that.

  13. The following user thanks Deton For this above post:

    bullydog (17-05-2009)

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    Quote Originally Posted by Deton View Post
    yes it does.
    RAM speed changes but not the timming therefore you can't use it. You have to manually tweaking it. This is going to take some time.

    I have no problem to get XMP boot at 209 Bclock but I have a hard time to get it pass that.
    Thanks for confirming that Ram speed changes as you increase bclk. So XMP only keeps the timing as it is... not memory speed.

    I will see what can do perhaps i will work with 1200++mhz Memory speed and work on my overclock speed and settle the Memory speed later when i've saved enough $$$ for some Corsair Dominator GT 2000mhz

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    Going higher than 209 BCLK will be difficult, that's reaching the very top end of the mobo on "normal" cooling. Highest BCLK I hit was 215 on the Rampage II Extreme. Couldn't go that high even with the EVGA Classified, so the P6T is being stretch to the max at 209.

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    Yeah...I know P6T hit the brick wall at 210, no body can't pass that.
    Bully, I don't think it's worth to upgrade to 2000Mhz RAM especially the Dominator GT. The sucker is expensive, even you trade in your current RAM and you still have to diss out some heavy $$$.

    Try to get you D0 to stable with 200Blck with HT/Turbo on like me and call it the day. This damn bastard is running too hot at high clock. I'm sure even with D0, maybe a little bit cooler but still not worth it.

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    Quote Originally Posted by Deton View Post
    Yeah...I know P6T hit the brick wall at 210, no body can't pass that.
    Not entirely true.
    Have mine stable at 212 atleast.

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