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Thread: Ga-p55-usb3 f8 and i5-750




  1. #81
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    Default Re: Ga-p55-usb3 f8 and i5-750

    That was the purpose of me posting. Of course you can run as much voltage as you need and you can find the least amount possible if you really want to. Just that the OP seemed shocked by Normal giving the CPU 1.3V, which is absolutely nothing to worry about. Also the use of DVID in this kind of situation is pretty pointless. Simply setting a lower VCore is a much better solution. Why run the CPU with higher voltage idle than under load? Sure C1E and EIST would lower it at idle but the OP hasn't stated if they've tested stability using EIST etc. The first tests should be done with all power saving options off anyway, otherwise any results could be unreliable.

    I'm not saying don't use DVID IF the PC is stable using power saving at idle, just that it's not something to jump to right away.
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  2. #82
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    Default Re: Ga-p55-usb3 f8 and i5-750

    yes but by using dvid it knocks off the amount selected only at load,when idle it uses much less,if he set it to a fixed lowered cpu voltage then it wouldnt throttle voltage when idle,only when cpu voltage is set to normal or auto it can throttle down,any fixed amount and it wont,thats they key to using normal cpu voltage and adding extra or taking off voltage at load through dvid

    eist must be enabled in the bios for it to downclock at idle,c1e can be disabled aslong as you use balanced profile in win7 power saving options or minimum hardware setting in xp power saving options

    that way it will work like your gpu does,when browsing the net ect it runs on lower clocks and voltage and when you decide to play a game ect it switches to full speed/voltages same thing for the cpu

    why would you want to run at 4+ghz and 1.3065v just for web browsing ect? its much more efficient and kinder on the cpu to clock through dvid but this is just my opinion and the way i like to run my pc,if you want to set a fixed amount of cpu voltage and run the cpu at full speed 24/7 then thats fine and wont effect cpu life ect
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  3. #83
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    Default Re: Ga-p55-usb3 f8 and i5-750

    Quote Originally Posted by Psycho101 View Post
    Sure C1E and EIST would lower it at idle but the OP hasn't stated if they've tested stability using EIST etc. The first tests should be done with all power saving options off anyway, otherwise any results could be unreliable.

    I'm not saying don't use DVID IF the PC is stable using power saving at idle, just that it's not something to jump to right away.
    I mentioned nothing about not using it.
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  4. #84
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    Default Re: Ga-p55-usb3 f8 and i5-750

    Quote Originally Posted by Psycho101 View Post
    Also the use of DVID in this kind of situation is pretty pointless. Simply setting a lower VCore is a much better solution. Why run the CPU with higher voltage idle than under load?
    dvid will throttle cpu at idle and add or reduce load voltage by -0.00000v or +0.00000v amount,thats what i was referring to
    if its unstable and crashes you either add more voltage in dvid +0.0 or take off more at load -0.0v,idle voltages will still downclock to less than 1.0000v around about 0.6000v-1.0000 depending on the total amount of voltage used

    if you were stable with a set amount of voltage then applied the power saving voltage and it became unstable you would be in the same situation so either way it doesnt matter where you start,better to start with more than needed then test and find the lowest amount of voltage thats stable

    taking into account vdroop ect,idk but ive never had any issues with clocking while the power states are enabled, at very high clocks 4.3ghz+ you would need to scrap the use of dvid and c1e eist ect

    personally ive had no trouble with stability at 4.2ghz and using eist/dvid,but i know what you meant, each to their own really,everyone has their own way of clocking
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  5. #85
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    Default Re: Ga-p55-usb3 f8 and i5-750

    You're misquoting me, read my post as a whole. AFTER the OP has a stable over clock, then they can do what they like with DVID etc. Until then, manually set voltages, find the lowest stable voltage for that OC THEN mess around with DVID. And it certainly does matter whether you start with power saving and DVID or with manual voltages. Just enabling EIST/C1E and DVID then trying to get things stable means you have two potential "problems" if something isn't stable. You don't know if the DVID value is set so that load VCore is too low or if power saving voltages are causing issues with stability.

    If you start with a set voltage then enable DVID and EIST/C1E and it becomes unstable, you know that it's definitely a DVID or power saving issue. If you try and establish an initial OC with them on, then things aren't clear. Is it a power saving issue? Is it just a general case of a single voltage being to low? can the CPU simply not handle that clock with that specific Bclk at that specific temperature?

    Over clock first, enable any power saving features later. It takes zero extra time and saves any trouble. Once done you can easily replicate the stable OC using DVID. Eg if it turns out the CPU is stable at 1.24V for example, you can go right ahead then and set VCore to normal and use the apropriate DVID value to reduce the Normal voltage to match the known stable OC voltage. At least that way you know 100% for ceertain that if the system fails in testing it's an issue with DVID value. When that's sorted, enable EIST and C1E and after a quick LinX run, use the system. No point extensively testing for EIST/C1E stability at load, because most likely any issue with those features will result at a crash while idling.

    The suggestion to go ahead and start playing with DVID, to me, seemed triggered by the OP's surprise that his CPU had a VID of 1.3V. That's absolutely fine. No need to get heavy with voltage reductions until they have their OC finalized. DVID is a good tool, but it really shouldn't be used until you at least have some indication on stability and some working stable voltages without it.
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  6. #86
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    Default Re: Ga-p55-usb3 f8 and i5-750

    i dont clock like that,i set cpu voltage on normal and see how far i can raise bclk before blue screens,i generally keep qpi/vtt around 1.3v mark for me i could reach 3.8ghz stable on normal cpu voltage,then any extra/higher bclk i add extra voltage through dvid,in the op's case he was working in reverse as in reducing load voltage untill unstable ect

    even 1.3065v for stock cpu clocks seemed a little excessive? and you can always improve on things
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  7. #87
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    Default Re: Ga-p55-usb3 f8 and i5-750

    Same. I also see how far I can go on stock voltages first. That way you can get a feel for just how much default head room the specific chip has. A lot of reviewers do this too. For instance I have been keenly reading the more in depth reviews of the recent AMD cards and like to know how far things go on stock voltages first as it gives a good feel for how good an over clocker any revised architecture actually is.

    I'd still be wary when it comes to VID. Who knows why 1.3V was set for that particular chip? Maybe Intel testing found that at temps near tCaseMax, issues were encountered with lower voltages. I'm also sure that Intel don't set the exact voltage they found to be all round OK, rather they add a tick or two for good measure. Silicon does vary a fair amount, and even CPU's cut from the same silicone wafer, perhaps even adjacent to each other on the wafer can vary greatly. the slightest hint of impurities in the silicon can cause minor fluctuations in resistance at given temperatures etc.

    I haven't encountered a CPU yet that can't run lower volts at stock, however I also haven't encountered many that will do the same at anything more than a very mild OC. Lynfield i5/i7, or at least the ones I've used generally have required more voltage than socket 1336 i7's at comparable frequencies. Quite why, I am uncertain, but the general trend for needing slightly higher voltage seems to be confirmed by Intel, via them setting a higher maximum voltage (1.4V) for socket 1156 based CPU's.
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  8. #88
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    Default Re: Ga-p55-usb3 f8 and i5-750

    is it intel themselves that set the cpu voltage or is it left to the mb and bios to set a specific amount? all dvid does is allow the cpu to still underclock when idle and remain stable at 100% cpu load due to the extra voltage added to the stock cpu voltage

    the cpu underclocks auto at idle kinda like a bigger version of intel turbo boost





    if i set cpu voltage to 1.23v it wouldnt underclock itself at idle,so i set to normal (1.18750v) and add +0.0750v=1.2625v which shows 1.232v in easytune/cpu-z due to voltage droop
    Last edited by wazza300; 12-16-2010 at 08:44 AM.
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  9. #89
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    Default Re: Ga-p55-usb3 f8 and i5-750

    Intel decide what voltage each individual CPU will operate at when Auto (no OCing) or Normal are selected. Exact details on the testing process seem unknown, but likely they are briefly tested at near max load. Possibly they're not even tested on a motherboard, but using specialist equipment able to analyse the component on a lower level. Who knows really. I'd be interested to find out though.
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  10. #90
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    Default Re: Ga-p55-usb3 f8 and i5-750

    Quote Originally Posted by Psycho101 View Post
    The suggestion to go ahead and start playing with DVID, to me, seemed triggered by the OP's surprise that his CPU had a VID of 1.3V. That's absolutely fine.
    So how come i am running 24/7 with 1.1v (and i can go lower)? If it wasnt 1.30625 it would be the next favorite intel voltage which is 1.28625v. I am sure 90% of the chips a hovering in that area of 1.25 - 1.3. Well you know Noctua, CoolerMaster etc. all have to make a living don't you think? (temps dropped 10C on stock cooler)

    And about the DVID i totally agree with wazza, why have a constant voltage running through the CPU when you can operate it like the GPU cards which idles and loads according to the task requested. You can't do that with fixed voltage. But i know what you are saying : disable all the voltage ups and downs to find the lowest minimum. Well you can do that with DVID also. If i go into the bios right now and set DVID -0.2 that would cause issues i guess, and i would have to tweak it. It is a matter of choice really.

    P.S. 1.3v isn't fine when i opened CPU-Z running prime95 and the voltage was 1.326 on stock clocks. I could fire a rocket with that voltage.
    Last edited by Darkling; 12-16-2010 at 02:21 PM.

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