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Thread: I feel unsure about: QPI/VTT 1.48...QPI PLL 1.4




  1. #21
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    Default Re: I feel unsure about: QPI/VTT 1.48...QPI PLL 1.4

    yes it will corrupt win7 if it crashes badly,try clearing the cmos by removing the mb battery for 30mins or overnight,make a note of any bios settings as it will wipe them clean when you remove battery,it could have corrupted the cmos too if its crashing in windows at stock settings
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  2. #22
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    Default Re: I feel unsure about: QPI/VTT 1.48...QPI PLL 1.4

    ussually when ram gives errors it will corrupt windows, IBT didnt corrupt windows, your overclock did. what is the rated votlage for your ram? I would run at that voltage, and then test it with Memtest.

  3. #23
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    Default Re: I feel unsure about: QPI/VTT 1.48...QPI PLL 1.4

    --"ussually when ram gives errors it will corrupt windows, IBT didnt corrupt windows, your overclock did. what is the rated votlage for your ram? I would run at that voltage, and then test it with Memtest."

    This was my hunch as well. I did not mean to imply that IBT--the software--corrupted W7. Rather, I believe that it prompted a memory error, which is understandable since it is designed to see if it can do just that. That is why I am continuing to stress test my BIOS settings with this program. :)

    I have these sticks:

    Newegg.com - CORSAIR XMS3 12GB &#40;6 x 2GB&#41; 240-Pin DDR3 SDRAM DDR3 1600 &#40;PC3 12800&#41; Desktop Memory Model HX3X12G1600C9 G

    It says it will take 1.6. But with my new overclock, I have had to raise V to 1.64. With IBT set to maximum, it has just passed 7 rounds so far and is still chugging along on its eigth round. I am running with 10-12-12-32 at 1750. If IBT shows stability after 10 rounds, then I will try to return to 9-10-9-24. Unfortunately, I cannot do 9-9-9-24 if it means raising QPI/VTT over 1.34.

    I have also raised VCORE to 1.225.

    I have some questions.
    (1) If the problem is not insufficient cpu V but, rather, insufficient memory V, then do you think I can leave VCORE at 1.2, which seemed stable to me?
    (2) Is 1.225 considered well within the bounds of safe VCORE? I know you said that 1.55 was the safe limit. But I want to stay away from the limits of safe V.
    (3) Do you think VDIMM at 1.64 should be fine?
    (4) Does Checkdisk permanently alter harddrives?

    Keeping in mind wazza300's advice, I was able to schedule checkdisk upon reboot before Explorer crashed. Checkdisk restored stability to W7, which saved me the trouble of having to reinstall W7. But I think I read somewhere that Checkdisk may permanently alter harddrives if it finds bad sectors. I don't think I have any physical problems with my drive, though.

    --"try clearing the cmos by removing the mb battery for 30mins or overnight,make a note of any bios settings as it will wipe them clean when you remove battery,it could have corrupted the cmos too if its crashing in windows at stock settings"

    Holy WOW! I didn't know that can happen! For the time being, I will work under the assumption that CMOS is fine. I think the problem was that something went wrong on the software side such that when I reset my BIOS, W7 still couldn't function properly. But Checkdisk seems to have fixed the problem. Moreover, my system is now on its 9th round of IBT set to maximum.

    This leads me to believe that my sticks needed more V than the BIOS expected. Overclocked now to 1750, and with temps not reaching 70degC during IBT, it looks like 1.64 for VDIMM was what I was searching all week for.

    If I can keep my Vs but tighten timings to 9-10-9-24, then I suppose you folks will have greatly helped me figure out how to significantly lower QPI/VTT and QPI PLL and yet overclock both RAM and cpu higher than what I was aiming for.

    I should know in a couple of hours whether I can tighten RAM timings.

    I would like to add here that the only reason I stayed away from system memory multiplier "10" was because it is a common warning in the various forums to keep it at "6" or "8" for stability reasons. But I think "10" may be preferred if you are working with six sticks. Also, I am disappointed that my system simply will not do uncore: memory ratio of [2x+1, +2]:x. I wonder why that is. I wonder if raising memory multi to 10 is the reason for that.

    Thanks for staying with me so far.

  4. #24
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    Default Re: I feel unsure about: QPI/VTT 1.48...QPI PLL 1.4

    Oh, wow, IBT just finished. After 10 passes...it's stable?!



    My GFLOPS are around 49. Now to lower VCORE and timings...

    :D

    Should I raise BCLK, too? Maybe not.

    :D

  5. #25
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    Default Re: I feel unsure about: QPI/VTT 1.48...QPI PLL 1.4

    Quote Originally Posted by ROSESTEEL View Post
    Oh, wow, IBT just finished. After 10 passes...it's stable?!



    My GFLOPS are around 49. Now to lower VCORE and timings...

    :D

    Should I raise BCLK, too? Maybe not.

    :D
    what voltages cpu/qpi/vtt did it pass ten runs with?
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  6. #26
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    Default Re: I feel unsure about: QPI/VTT 1.48...QPI PLL 1.4

    I am going to let my system cool down a bit before I alter BIOS and do another run.

    I passed 10 runs on IBT with VCORE of 1.225 and QPI/VTT of 1.34.

    The first thing I want to do is return VCORE to 1.2. Based on previous testing and intuition, I am considering the possibility that the problem was not VCORE, but insufficient VDIMM. The system cannot function with less than 1.2, but I think 1.2 may work fine.

    :)

  7. #27
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    Default Re: I feel unsure about: QPI/VTT 1.48...QPI PLL 1.4

    if you only need 1.2-1.23v for cpu you might aswell set it to normal setting in cpu voltage list,that way it will throttle down when its idle if you enable c-states in the bios,dont enable c1e though just look in win7 power options and choose balanced,then test again for stability,1.3-1.35 is fine for qpi/vtt
    Gigabyte z77x UP4-TH F11c Modded Bios
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  8. #28
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    Default Re: I feel unsure about: QPI/VTT 1.48...QPI PLL 1.4

    Definitely try all settings regardless of any recommendations on forums etc. It may be true for them that a RAM multi of 10 was unsuccessful, and also for some others. However the findings in any forum may be only rare instances as there is almost always a very limited sample size. It's the same with even CPU multipliers on i7/i5/i3. I've never had any issues with using say 20x or 18x multi's but others have, so it's a case of trying it on your spacific system.

    I've used that RAM kit before on several systems, but as the 6GB equiv. I must say that it is excellent RAM, I've not had issues with timings at 6GB, but at 12GB it will depend very much on the motherboard and the CPU's IMC as to the results you get. I wouldn't hesitate to use up to 1.4V QPI/VTT to ensure stability with 12GB. I'd be fine with using higher VDIMM too. Note that I keep to the 0.5V rule, so if using a 1.3V QPI/ TTyou can potentially run from 1.4V-1.8V VDIMM. Of course, you need to observe the rated RAM voltage, but a small amount over the recommended will do no harm at all. For example your kit is rated for 1.6V, but as long as QPI/VTT is set right, up to 1.7V will not be a problem at all.

    Observing recommended and absolute voltages is always a good idea, but remember there is still a very small amount of headroom to increase them as long as it's not by a significant amount. OFC, chance of overheating and failure isn't liniar, but exponential for every mV above absolute V limits but using a sensible figure should not impact oin usable life of your components at all. EG if Vcore max is 1.4V on an i5 then 1.45V will not impact longevity by a significant amount, especially considdering an average usable life of a machine at 3-4 years. Temperatures are very important to monitor ofc and even at below max volts, if heat is too high then that can be a danger.

    For your OS drive, always make an image of the OS installed at stock settings before doing any major tweaking. I use Acronis to image. A complete restore takes around 3 minutes and means that you don't have to reactivate windows or re-install any of your programs and drivers. RAM settings are definitely the prime culprit of corrupting a HDD, especially if you've enabled "Advanced Performance" and "Disable write cache buffer flushing" in Device manager. System RAM may be used to cache reads and writes, and if the RAM is unstable it could cause corrupt info to be written to disk.
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  9. #29
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    Default Re: I feel unsure about: QPI/VTT 1.48...QPI PLL 1.4

    dude intel sometimes sets 930 stock vcore above 1.3v, your very very safe. Do not worry. You wont begin to lessen the life of your processor with vcore voltage until you hit 1.4, thats my opinion. You can safely take your vtt/qpi to 1.35 see if that helps with dram voltage. Have you done research abuot your ram and other people's experience with it?

  10. #30
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    Default Re: I feel unsure about: QPI/VTT 1.48...QPI PLL 1.4

    --"Have you done research abuot your ram and other people's experience with it? "
    These ram sticks seem to be well liked by their owners. I am happy with my set. I am testing now with IBT set to maximum at 9-10-9-24 at 1750. After 4 of 10 passes so far, it's doing fine. The problem with a good set of ram sticks is that not too many people seem to be asking for solutions to problems. I think most people just enable X.M.P. In fact, this was basically the advice given to me at Corsair's products forum. But I couldn't use X.M.P. with memory multi of 8 without using even more ridiculously high QPI/VTT to overclock my cpu. I did notice that others who have had the same problem I did--with high QPI/VTT--probably did not try memory multi of 10 and instead kept it at 8. The simple solution seems to be to use memory multi of 10 and not 8. :)

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