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  1. #1
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    Sandy Bridge Voltage Recommendations from OCUK

    beware those with sandybridge linked is a thread from overclockers uk
    http://forums.overclockers.co.uk/sho...php?t=18227652

    Hi there


    Right guys myself and our technical guys have spent the entire weekend and this morning in discussions with Intel regarding the alarming amount of reports of Sandybridge CPU's dying and have been conducting our own testing as have Intel to find out what is a definite no no.


    Sandybridge maximum safe voltages

    Core Voltage - Not recommended too exceed 1.38v, doing so could kill the CPU, we therefor recommend a range of 1.325-1.350v if overclocking.
    Memory Voltage - Intel recommend 1.50v plus/minus 5% which means upto 1.58v is the safe recommended limit. In our testing we have found 1.65v has caused no issues.
    BCLK Base Clock - This is strictly a NO, anyone using base clock overclocking could/will cause damange to CPU/Mainboard. (Set manually to 100)
    PLL Voltage - Do not exceed 1.9v!!



    Processor - Basically we recommend customers not to exceed 1.35v to play it safe, all our bundles are set at 1.3250v or lower, any competitors offering bundles above 4.6GHz you should be enquiring as to what voltage they are using as we believe anything over 1.38v will limit CPU lifespan and anything over 1.42v will likely kill the CPU or severely limit its lifespan.

    Memory - Intel recommend 1.50v plus/minus 5% which means 1.60v is the ideal safe maximum, but we have found in our testing all 1.65v memory is fine. We have also found most new 1.65v like Corsair XMS3 will run at its rated timings with just 1.50-1.55v which is well within Intel specifications. So people upgrading to Sandybridge you can still use your old DDR3, but we do recommend you run it at 1.60v or less. We are shipping most of our bundles which feature Corsair XMS at 1.50v-1.55v at rated timings. We've also discussed with Asus and MSI regarding voltages for memory and they also confirm in their testing 1.65v caused no issues with reliability.

    Base Clock - To put it simple if you value the life of your components, do not overclock using base clock!

    PLL Voltage - Again do not exceed 1.9v!
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  2. #2
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    Very interesting, thanks for sharing.
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  3. #3
    Member Castiel's Avatar
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    I know people with ES's that have been running 1.45v and 5ghz daily for over a month. I can't believe retail chips are that weak and can only take 1.35v.
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  4. #4
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    woppy1, you forgot the important closing remarks of that quote!
    These are just guidelines we recommend you follow, if you want to push more voltage through your CPU's then just be aware they could die on you. Your warranty is un-affected and we will honor any CPU's that die, we just won't ask questions as to how you killed them.

    Not all CPU's are as fragile as others, we have experimented upto 1.50v Vcore and 1.70v memory and had zero issues with reliability, so it seems some of fine when pushing hard.
    Thanks for sharing.

    Castiel, if these numbers came from Intel as they say, then they are likely relatively close to bulletproof. They seem quite conservative if going for max clocks and benchmarking, but for 24/7 use by the average user they appear reasonable.

    EDIT - Changed the topic title to make it a bit more descriptive.

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    woah, those brits in OcUK are amazing. How I wish they shipped to Spain or we had something like that... pipedreams
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    The dynamic vcore of Sandy Bridge is quite different from the previous Bloomfield generation. I can disable Turbo and run stock 34 multi (3.4GHz) for a 2600K and the chip/mobo will run one vcore ~1.26v and if I enable Turbo and set the turbo multis to 44 or 4.4GHz it will run another vcore ~ 1.30v load.
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  7. #7
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    It's user-selectable on certain boards too. That way you can raise the turbo multi and set only the Vcore it's stable at. One Vcore non-turbo, one turbo.

    This is an interesting new generation; a whole new world if you will. Fun stuff. Love new tech! (Just hope it's not too fragile as I just got my water loop ready for sandy and plan to have some fun. )

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  8. #8
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    Oh Jesus.

    I know a guy who has his OC'd to 5Ghz at like 1.46v or something. The moron heard 1.5v from a different guy. I gotta call him, I bet he bricked his CPU lol.
    Last edited by hokiealumnus; 01-10-11 at 09:23 AM. Reason: Language
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    Please mind the language D33PJackal.

    He's probably fine short-term. That setting is probably not a great idea for 24/7 use. It's tempting to try for a 5GHz 24/7 system with these for sure, but may end up being less than practical before all is said and done.

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  10. #10
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    Quote Originally Posted by Castiel View Post
    I know people with ES's that have been running 1.45v and 5ghz daily for over a month. I can't believe retail chips are that weak and can only take 1.35v.
    remember the cpu may have 3yr warranty but it's life time could be 5 to 15 yrs, so shortened life at higher than safe volts maybe 2-5yrs versus 5-15yrs hehe

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  11. #11
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    Quote Originally Posted by eva2000 View Post
    remember the cpu may have 3yr warranty but it's life time could be 5 to 15 yrs, so shortened life at higher than safe volts maybe 2-5yrs versus 5-15yrs hehe
    I only need to keep this 2600K till Ivy Bridge rolls out
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    Quote Originally Posted by hokiealumnus View Post
    woppy1, you forgot the important closing remarks of that quote!


    Thanks for sharing.

    Castiel, if these numbers came from Intel as they say, then they are likely relatively close to bulletproof. They seem quite conservative if going for max clocks and benchmarking, but for 24/7 use by the average user they appear reasonable.

    EDIT - Changed the topic title to make it a bit more descriptive.
    thanks i was hoping someone would do that
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    Quote Originally Posted by dazz. View Post
    woah, those brits in OcUK are amazing. How I wish they shipped to Spain or we had something like that... pipedreams
    im sure this has been asked before and they will ship there as long as you pay the extra (could be wrong )
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  14. #14
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    Quote Originally Posted by woppy1 View Post
    Memory Voltage - Intel recommend 1.50v plus/minus 5% which means upto 1.58v is the safe recommended limit. In our testing we have found 1.65v has caused no issues.
    Wow that seems like a pretty harsh limit from Intel. Its wouldn't be surprising at all for unaware users to the fairly common 1.65v their memory requests. Even though it sounds like that isn't a problem it seems strange that Intel wouldn't plan to be able to handle it. I'm glad the sticks I already bought are only 1.6v.

    BCLK Base Clock - This is strictly a NO, anyone using base clock overclocking could/will cause damange to CPU/Mainboard. (Set manually to 100)
    Thats a bummer. I had hopes mobo manufacturers would come out with some "robust" boards that could tollerate some small amount like 110 or 115 or so.
    Maybe the market just needs time. Realtek, marvel, etc. need time to create some overclocking tollerant 3rd party chips.

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    In this case, I really don't think it's possible. Everything is on-die. Adjusting it just adjusts too many other things. It's ok to toy with for max clocks, but for 24/7 use I'd stick that at 100 and forget it exists.

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  16. #16
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    I haven't heard of a single SB dying, let alone alarming numbers of them!

    Keep in mind that Intel is giving numbers for 99% of cpus to last 10 years, as they always do.
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  17. #17
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    Quote Originally Posted by woppy1 View Post
    im sure this has been asked before and they will ship there as long as you pay the extra (could be wrong )
    That would be awesome woppy! I'll search their forums for info now. Thanks so much!
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    Quote Originally Posted by DaveHCYJ View Post
    Thats a bummer. I had hopes mobo manufacturers would come out with some "robust" boards that could tollerate some small amount like 110 or 115 or so.
    From the reviews I've seen, anything over about 105 to 106 BCLK won't work as it throws things too far out of spec. I suspect 102-104 will probably work okay, but as usually, do so at your own risk. Who knows what all this will do when combined with high voltage. Again, if it boils down to a safe 24/7 O/C, then you might leave it locked to 100 mhz.
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  19. #19
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    Yeah I'm O/Cing for 24/7 use so I won't be touching bclk, but its still fun to read about what other people manage to do in benching type scenarios.

  20. #20
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    Quote Originally Posted by woppy1 View Post
    beware those with sandybridge linked is a thread from overclockers uk
    http://forums.overclockers.co.uk/sho...php?t=18227652

    Hi there


    Right guys myself and our technical guys have spent the entire weekend and this morning in discussions with Intel regarding the alarming amount of reports of Sandybridge CPU's dying and have been conducting our own testing as have Intel to find out what is a definite no no.
    Quote Originally Posted by Bobnova View Post
    I haven't heard of a single SB dying, let alone alarming numbers of them!

    Keep in mind that Intel is giving numbers for 99% of cpus to last 10 years, as they always do.
    This is where the report of them dying is above.

    Also you can't say the voltages above will be safe for 10 years of use, unless you can prove intel said that.
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