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  1. #1
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    How to Overclock i7 860 on Gigabyte P55-UD3R

    The last time I overclocked was when all you had to do was bus speed and CPU multiplier. Can some one explain the logic of tweaking all the different options ie. bclk, qpi and how this affects pcie bus and memory. Can someone give me a step by step order as to what settings to change?

    Also, is there a good boot cd to check for system stability ?

    Thanks
    Last edited by dcohen; 10-27-2009 at 09:00 AM.

  2. #2
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    Re: How to Overclock i7 860 on Gigabyte P55-UD3R

    OK



    BCKCLK is the equivalent of the old-fashioned bus speed. UNCLK (uncore) and QPI run as ratios to it.
    Uncore is the clock for the memory controller - what used to be the northbridge (but not the memory itself, which is a separate control).
    QPI is the chipset (what used to be the southbridge) controller.
    Thus, as you raise BCKCLK the other two will go up, and so will the RAM speed.

    Please don't ask me about the voltage controls, because it will take me a while to remember which is which. By and large though, you can stay with just Vcore (the CPU) QPI PLL (QPI of course) and DRAM voltages for the early parts of your experiments. Later you can play with CPU PLL and CPU VTT!

    The CPU also has a mutiplier, such that BCKCLK x mult = CPU speed. Mine is currently 196 x 21 = 4116MHz for instance.


    Some rules:


    1) Try to stress each bus in turn, so you know the limits. Start with RAM, then go through Uncore and QPI, and finish with BCKCLK.

    2) Generally Uncore data speed should be at least twice memory, and QPI should be twice Uncore - some say x2 +1. So if RAM is 1600, Uncore should be 3200 and QPI 6400 or higher.

    3) With i7, the max you can get Uncore is about 3500, and the max you can get QPI is about 7500, but I don't know for i5. You should aim to be as close to these figures as you can get without exceeding them - or whatever limits you discover.

    4) The max you will get BCKCLK is probably about 205-210.


    With that in mind, raise BCKCLK a little. Note the values of Uncore and QPI, and remember what I said in the rules. Test. Rinse and repeat. If it falls over, lower the RAM divider first. If that fails, look to the other speeds and lower each uin turn until you've fixed it. Last resort is raising voltages.


    M
    Last edited by Meridian; 10-27-2009 at 05:48 PM.

  3. #3
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    Re: How to Overclock i7 860 on Gigabyte P55-UD3R

    Thanks for that detailed response. I still have some questions but let me try some things out first.

    Do you have a boot cd you like for testing stability?

  4. #4
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    Re: How to Overclock i7 860 on Gigabyte P55-UD3R

    I just boot into Windows - which is pretty stressful - and then start with something like 3Dmark06. Longer-term testing is with Prime95 on Blend.


    M

  5. #5
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    Re: How to Overclock i7 860 on Gigabyte P55-UD3R

    My main reason for a boot cd is that I don't want to have a bad crash in Windows while oc'ing and corrupt my hard drive and Windows installation.

  6. #6
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    Re: How to Overclock i7 860 on Gigabyte P55-UD3R

    Quote Originally Posted by dcohen View Post
    My main reason for a boot cd is that I don't want to have a bad crash in Windows while oc'ing and corrupt my hard drive and Windows installation.
    Hasn't happened in a long time, well at least not very often since the pci bus has been locked. I still keep my OS on a different partition/disk so if I have to redo Windows I don't lose my data. That comes in handy, but never an OC problem for me.


    "The significant problems we face cannot be solved at the same level of thinking we were at when we created them."
    - Albert Einstein (1879-1955)

  7. #7
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    What do do first ?

    As I stated earlier, it has been awhile since I oc'd.

    I read or am reading the Xbit article , which is very good, so I am ready to do the first step

    Lower the memory frequency, lock the timings and voltages then I guess increase the bclk determine the IMC voltage.

    Not sure what is the IMC voltage but first, what do I do with my memory ?

    I have

    Model
    Brand OCZ
    Series Platinum
    Model OCZ3P1333LV4GK
    Type 240-Pin DDR3 SDRAM
    Tech Spec
    Capacity 4GB (2 x 2GB)
    Speed DDR3 1333 (PC3 10666)
    Cas Latency 7
    Timing 7-7-7-20
    Voltage 1.65V

    So what do I initially do with the memory settings and what is my goal for these settings ?

  8. #8
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    Re: How to Overclock i7 860 on Gigabyte P55-UD3R

    IMC may be a typo for ICH. Or IOH? Both should be left alone for the moment. Otherwise I'm not sure what they mean.


    As for the memory, just watch the speed, because as you raise BCKCLK it will almost certainly give up first. If the rig becomes unstable, lower the RAM divider (that is, run the RAM slower). If the instability disappears, you've just discovered the fastest possible speed for your RAM.


    M
    Last edited by Meridian; 10-30-2009 at 02:16 AM.

  9. #9
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    Re: How to Overclock i7 860 on Gigabyte P55-UD3R

    Hi all. I'm getting an 860 with a nice fat zalman hsf to cool it and will be putting all this on a gigabyte p55 udp4 mobo with some dfominator memory. I can be more specific if the need arises. My first build in over two years, I downloaded the manual and, like whoa, what are all these settings? Unbelievable all the bios tweaks for the cpu and memory.

    Anyway, I came to this forum and found this thread, and thought I'd post. I'm really looking forward to the challenge and anticipate a lot of learning. My only concern is screwing something up as I've read a little bit (I emphasize little and I will need to read more) that these lynfields have a slight flaw re. the pci-e bus and I may have to pump some voltage for an overclock, and be careful how I OC as OCing the cpu also OCs the pci-e bus as well and can affect the card on that bus. Something like that. Geez, I thought we got over that years ago when, I forget the term, but when bus speeds for the agp and pci buses were locked and unaffected by overclocking the cpu. Nvidia chipsets did it (AGP/PCI lock, now I remember), via did not, and thus via boards did not OC well and eventually passed from the scene. Something like that.

    Anyway, I look forward to a challenge here and may be posting back as I step through this. BTW, I plan on doing most of my OC tweaks before I even install my HDD, will likely use Utlimate CD or whatever it's called, plus just some basic memtesting.

    marty
    Last edited by alex666; 01-17-2010 at 11:20 AM.
    Gigabyte P55A-UD4P, Core i7-860 Lynnfield at 3.6GHz, ZALMAN CNPS10X QUIET 120mmCPU HSF, CORSAIR Vengeance (2 x 4GB) DDR3 at 1640, PowerColor HD5870, Earthworks 650W PSU, Samsung 840 EVO 120g SSD (W10 Pro 64-bit), 320G Blue Caviar storage, LiteOn DVD burner, Antec 902 case [B]
    ASRock Z68 Extreme3, i5 2500K OCed at 4.5GHz, CM 212 Hyper Plus, G. Skill Ripjaws 4G X 2 2133 Ram, Samsung 840 EVO 250G, 3Tb Seagate HDD, unknown DVD drive, XFX Double D Radeon HD 7870, PC Power and Cooling 610 Silencer, Fractal Define R4 Case, LG 27" AOC IPS monitor, Win 10 Home 64-bit

  10. #10
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    Re: How to Overclock i7 860 on Gigabyte P55-UD3R

    Hadn't realised that the PCI-E bus isn't locked. I knew they'd fiddled with stuff with the new chipsets, but not that they'd tied the PCI-E to another bus. So glad all my rigs are X58.


    M
    Last edited by Meridian; 01-18-2010 at 03:40 AM.

  11. #11
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    Re: How to Overclock i7 860 on Gigabyte P55-UD3R

    Yeah, I came across this:

    http://www.anandtech.com/cpuchipsets...px?i=3634&p=19.

    I actually found this link from a review of overclocking the 860 here at PC Per:

    http://www.pcper.com/article.php?aid...=expert&pid=12

    Doesn't sound like anything that cannot be resolved, as people are OCIng this chips pretty reguarly.

    marty
    Gigabyte P55A-UD4P, Core i7-860 Lynnfield at 3.6GHz, ZALMAN CNPS10X QUIET 120mmCPU HSF, CORSAIR Vengeance (2 x 4GB) DDR3 at 1640, PowerColor HD5870, Earthworks 650W PSU, Samsung 840 EVO 120g SSD (W10 Pro 64-bit), 320G Blue Caviar storage, LiteOn DVD burner, Antec 902 case [B]
    ASRock Z68 Extreme3, i5 2500K OCed at 4.5GHz, CM 212 Hyper Plus, G. Skill Ripjaws 4G X 2 2133 Ram, Samsung 840 EVO 250G, 3Tb Seagate HDD, unknown DVD drive, XFX Double D Radeon HD 7870, PC Power and Cooling 610 Silencer, Fractal Define R4 Case, LG 27" AOC IPS monitor, Win 10 Home 64-bit

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