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Thread: Noob here tryin to OC my Q9550 for first time :D




  1. #11
    Chike is offline Senior Member
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    Default Re: Noob here tryin to OC my Q9550 for first time :D

    The CNPS8700 may hold quad at 3.2GHz not sure about 3.4, I had it up to 3.4Ghz on my C2D, did OK considering my ambiant temp.
    400 FSB can take you up to 3.4GHz with ram atDDR-800 as now or DDR-1066 if you can make it work with 2.66D multiplier.
    Set CPU Vcore/Termination/PLL manually to their default value and you're good to go.
    You can than try 400FSB with CPU Ratio 7.5 and 2.00D memory multiplier and everythibg else as it is. A little more CPU Termination and MCH Core may be needed. No OC yetm just to see memory related settings are OK.
    If that work and you want to try DDR-1066 again, set all timings on auto with CMP profile1 and Static tRead Value 8-9 to begin with, and see how it goes.
    Then you increase CPU Ratio graduately, adding Vcore, and possibly CPU Termination and PLL.

  2. #12
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    Default Re: Noob here tryin to OC my Q9550 for first time :D

    Cool man, thanx for the video link, I'll definitely check it out and hopefully shed some light on all this new stuff I am tryin to understand

    Thanx for reply Chike, so do you mean that I can leave my DDR-800 settings as is and leave my multiplier alone as is. Then, set CPU Vcore/Termination/PLL manually to their default values. Then, set FSB to 400 and I will get around 3.2-3.4Ghz?

    Are you then saying after I have tried that and it is stable I make the CPU ratio 7x plus the 0.5 makes it 7.5 and change my memory to 2.00D and then add some more CPU termination and MCH core and that will further increase my OC to ??

    Sry just trying to get this all straight, its kinda confusing ;; thanx for any input guys ^^
    Last edited by Brigs; 09-24-2009 at 11:11 AM.
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  3. #13

    Default Re: Noob here tryin to OC my Q9550 for first time :D

    Ok. Your cpu clock speed is the product of two things
    cpu multiplier x fsb

    You can't increase your cpu multiplier but you can increase your fsb. If you were to increase the cpu multiplier, you would gain a faster processor without affecting your ram or your motherboard. If you increase your fsb, you gain a faster processor by making all your your ram, cpu, and your mobo run faster; in other words you are overclocking all 3 parts.

    Thats why in general when you OC a processor, you need a good board and some high rated ram. Its not that the high rated ram by itself makes your pc faster; rather it just provides headroom for you to overclock. For example, if you cpu can overclock by a million mhz and your ram can only overclock 20mhz, no matter what you do to the cpu, your upper limit will be about a 20mhz overclock. The same works in reverse. If your cpu can only overclock 200mhz but your ram is rated for a million mhz, regardless of what you do with the ram, your upper limit for the overclock will be about 200mhz. There is no advantage to running your ram faster than your cpu.

    The RAM has its own multiplier which controls how fast it runs. It can run in step with the cpu (1:1) or out of step with the cpu (faster than the cpu, or slower than the cpu). It all depends on what multiplier you choose. In general there is no advantage to running your ram faster than you cpu, and its disadvantegeous to run it slower than you cpu. The best scenario is to run your ram exactly in step with your cpu. To do this you need to use a 2.00 multiplier.

    MCH latch frequency is an obscure thing, but it basically sort of determines the frequency setting the mobo runs. In general most people find stability with the 333mhz latch or the 400mhz latch. If your fsb exceeds 500mhz, often the 266mhz latch starts to creep in as the most stable setting. For your case I strongly recommend you go with the 333mhz latch and a 2.00B multiplier.

    In terms of general overclocking (ie not looking for the maximal possible overclock), there's not too much you really have to do with RAM. Give it a good multiplier (2.00B) and enough voltage (2.0-2.1V) and fairly loose timings (5-5-5-18) and you're generally good to go. All those settings are fairly easy to find in the motherboards overclocking page.

    For the board, there's generally not too much to do. Most boards by gigabyte are built for overclocking. All you have to do is ensure that the mch chipset has enough voltage. You generally don't want to exceed 1.4V and most people find stability in the 1.2-1.3 range. Thats about all you have to tweak.

    The cpu's stability is generally affected by 3 things:
    1) the fsb
    2) cpu vcore
    3) cpu vtt

    There are other settings that can be tweaked and manipulated, but in terms of generally overclocking and not looking for the maximal possible overclock, those 3 things are the primary determinants you will be playing with. The other settings really only come into play when you're doing serious stability testing (ie prime95 runs for 6hrs then crashes, so you play with cpu ref to see if you can get a 12hr run and etc)

    Generally with cpu vcore anywhere from 1.2-1.4 volts is what you need to stably run anywhere from stock speeds to 4ghz+. Cpu vcore is the most important voltage and plays the largest role in stabilizing your overclocked cpu. In terms of cpu vtt, you generally will not exceed 1.3 (though some people use as high as 1.4-1.5). Its fairly important, but generally you don't start adjusting it, until you hit a bit of a wall with the cpu vcore.

    In general, you overclock by starting out with setting you know you will need to run your system stably: 2.1v on the ram, 2.00B/d multipliers, 1.3v mch chipset.

    I'd suggest manually entering your cpu vcore and your cpu vtt (just pick the stock settings or better yet punch in 1.32 for cpu vcore and 1.3 for cpu vtt).

    Then increase your fsb by 10mhz and see if you can boot to windows. If you can boot, restart the pc and increase the fsb by 10mhz again. Do this until you cannot boot into windows or you are satisfied with the overclock. Once you cannot boot into windows most likely it'll be the cpu failing, so bump up the vcore, by one step and see if that'll let you boot into windows.

    Essentially once you've found a speed where you cannot boot into windows or you're satisfied and adding cpu voltage doesn't help, back off 10mhz and try to stabilize that setting. This is where stress testing comes into play. You stress test to so that you don't get random crashes all the time with your cpu. To do so you're going to need a program like prime95.

    I personally like to run prime blend right away because I'm pretty keen on figuring out why my pc is having a crash. If you run prime and you have one core fail, it's most likely a cpu vcore or cpu vtt issue. If you run prime and you have all cores fail, or a total system lock up, its most likely a ram or mch issue. If you run prime and it doesn't even run for a sec before failing, it could be anything so back off 10mhz on the fsb and try to stabilize that spot. Keep good records (screenshots) of settings and amounts of time prime ran before crashing and its generally easy to figure out if a change you made was a good change or a bad change. If I'm trying to figure out which cpu value I need to change, I try one and see if it gave me an increase in the amount of time the stress test ran stably. If it did, I keep it, if not I reset to the previous setting and try another value. Change one thing at a time, take little steps, and pay attention. Stress testing is the heart and soul of overclocking. Anyone can get their system to boot at ungodly speeds, but its hard to get your system stabilized at those speeds.

    To get your q9550 up to 3.2 you don't really have to do much. Assuming you have a 2.00B multiplier, a 333mhz latch, 2.0-2.1 v for the ram, and 1.3v for the mch chipset, you probably don't have to adjust any cpu settings to get it to run reliably. Be warned though, the gigabyte board overestimates cpu vtt and cpu pll when you overclock and it can really put in some high voltages for those values. I strongly suggest you plug in a value for your cpu vcore, 1.3 v for the cpu vtt and 1.5-1.58 v for the cpu pll manually just for stabilities sake because the auto settings can overshoot what you really need by a quite a bit.

    Anyway here's a screeny of the settings I use on my q9550 E0 on my ga-p45-dsq for 4ghz. I realize you are shooting for a much lower overclock, but if these settings work 4ghz, they'll most certainly work (and be overkill) for 3.2ghz most likely.



    Once you have stable settings (due to nice long prime95 blend runs), start backing down the voltages and testing for stabilty until you've minimized them. You should also at that time try to tighten up your timings.
    Last edited by Sunburn74; 09-24-2009 at 11:32 PM.

  4. #14
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    Default Re: Noob here tryin to OC my Q9550 for first time :D

    Wow, that was an awsome reply Sunburn, perfectly stated so I understand what everything means, THANK YOU very much for taking the time to write that out, much obliged

    Ya so I will do what you said with the 2.00B multi, enter voltages manually, have my DRAM at 2.1v and MCH core at 1.3v.

    Can I leave my memory timings at 4-4-4-12 , tRD at 7, Cmd rate at 2 and advanced timings as they are per my BIOS manual settings?

    And also my FSB is currently both 333Mhz, where you saying I should leave it at 333 or up it to 400Mhz? And thats the FSB on the cpu not the ram correct?

    And the end result is I should be running at about 3.2Ghz and 800Mhz ram speed?

    Thanx again man, that was excellent in-depth information for a noob like me
    Last edited by Brigs; 09-24-2009 at 01:53 PM.
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  5. #15
    Chike is offline Senior Member
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    Default Re: Noob here tryin to OC my Q9550 for first time :D

    FSB control both CPU and RAM speed, FSB xCPU Ratio = CPU speed, FSB x memory multiplier = RAM speed. Just increasing FSB will increase them both.

    I am titaly against "this work for 4GHz it will sure work for 3.2GHz" approach. Why start stable and find instability and not the other way?

    I suggest incremental OC, FSB with no ram or cou OC, then increasing cpu speed and ram if you want to give it another try.

    400 FSB with CPU Ratio 7.5 will set cou on 2.8GHz as it is now, only FSB related settings need to be changed if needed, Vtt and possibly PLL, only minor changes for that kind of OC. Once stable you can increasee multiplier and vcore if needed.

    2.00B multinplier may work at 400 FSB, 2.00D is more likely to work as it was desugned for this FSB. You may need to increase tRD, other timings sould be good as they are now. Start with tRD 8 or 9 just to eliminate the possibility it is the problem in case you have any.

  6. #16
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    Default Re: Noob here tryin to OC my Q9550 for first time :D

    Thanx for reply

    So two questions~

    1- When I set my FSB to 400, I should drop my CPU ratio to 7.5?

    2- What is the difference between 2.00B and 2.00D strap?

    thanx again guys
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  7. #17
    Chike is offline Senior Member
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    Default Re: Noob here tryin to OC my Q9550 for first time :D

    Quote Originally Posted by Brigs View Post
    1- When I set my FSB to 400, I should drop my CPU ratio to 7.5?
    You don't have to, I only suggest it so you would OC in steps, FSB first, then CPU, then ram. This way you will learn which changes are nesessary for each one of them, and have better understanding of what should be looked for in future OC you may want to do.

    Quote Originally Posted by Brigs
    2- What is the difference between 2.00B and 2.00D strap?
    The different straps as I understand it are a pre defined profiles for a set of parameters that for at least some of them we don't have direct access, and were designed for the different possible bus speeds.
    The B strap is made for 333 bus speed and D for 400, even though they might work with different bus speeds depend on the memory used.
    My PC for example won't boot with 2.00B mulriplier at 400FSB no matter what I do, while other using it successfully and with better results than 2.00D.

  8. #18
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    Default Re: Noob here tryin to OC my Q9550 for first time :D

    I watched those videos when I first got my board. Beware. The guy making them is definitely no OC expert. He seems to just whack VTT up to 1.4 (probably because he hears that's the max, and thinks max = good) and pump Vcore for his OC. Also setting other board options to normal is a bit lazy and not always the right thing to do. Set other sensative voltages to their stock settings initially, not auto, ie VTT - 1.2V, PLL = 1.5v and MCH = 1.2-1.3V. Reverence voltages can safely be left on auto.

    Take a look at Conners thread on his Q9550 as this contains loads of good advice as well as many different BIOS settings and templates. Post here with any break through you make. Also when you dial in your First relatively stable OC (try for 3.4GHz-3.6GHz first) we can help tweak things. It's difficult to just reel off settings for you to try as what works for one may not for another.

    Use that video for an idea of what the BIOS contains, but I wouldn't use any of the settings that guy does.
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  9. #19

    Default Re: Noob here tryin to OC my Q9550 for first time :D

    Quote Originally Posted by Brigs View Post
    Wow, that was an awsome reply Sunburn, perfectly stated so I understand what everything means, THANK YOU very much for taking the time to write that out, much obliged

    Ya so I will do what you said with the 2.00B multi, enter voltages manually, have my DRAM at 2.1v and MCH core at 1.3v.

    Can I leave my memory timings at 4-4-4-12 , tRD at 7, Cmd rate at 2 and advanced timings as they are per my BIOS manual settings?

    And also my FSB is currently both 333Mhz, where you saying I should leave it at 333 or up it to 400Mhz? And thats the FSB on the cpu not the ram correct?

    And the end result is I should be running at about 3.2Ghz and 800Mhz ram speed?

    Thanx again man, that was excellent in-depth information for a noob like me
    I suggest you loosen the timings and tighten them later. Punch in 5-5-5-18 or 5-5-5-15 to start. You generally can leave the other ram timings on auto.

    There is a difference between fsb and fsb latch frequency. FSB is what you will be adjusting to determing your clock speed (ie 8.5 x 333mhz will give you 2.83Ghz and 8.5x 400 will give you 3.4 Ghz). FSB latch frequency is a group of settings telling the motherboard (and ram) how to run. There generally are 4 groups (a 200mhz setting, a 266 mhz setting, a 333mhz setting, and a 400 mhz setting). These settings are sort of mysterious if you're a non engineer, but essentially most most people find stability using either the 333 mhz setting and 2.00B multiplier or the 400mhz setting and a 2.00D multiplier. If you break 500 mhz fsb (ie something like 8.5 x 500 mhz for 4.25ghz) you may find the 2.66 mhz setting to be the most stable of them all. But the key point is fsb and fsb latch frequency are completely different things.

    When you overclock you are trying to increase clock speed by increasing your FSB. Its generally good practice to try and find your upper fsb limit by increasing the fsb by small increments until you reach a point where you can no longer stably boot (ie my pc may be able to boot at 8.5 x 450 but when I try 8.5 x 460, it fails to boot). You can also simply stop where-ever your are satisfied (ie my pc can boot at 8.5 x 450, but I only want a smaller overclock so I choose to run it at 8.5 x 400). To run at 3.2 ghz you're going to need about 8.5 x 380.

    So start by manually entering in the appropriate settings (333mhz latch, 2.00 B multiplier, 5-5-5-18 timing, 1.3 v mch voltage, 1.5 cpu pll, 1.3 cpu vtt, and around around 1.25 cpu vcore. You also may want to turn off any sort of default turbo setting your board has as well as XMP memory profile. Leaving on EIST and CIE -power saving features that work by downclocking your processor when its not inuse- don't really make a difference in overclocking; they don't worsen your overclock, nor affect stress testing) and start increasing the fsb by 10mhz at a time. If you hit your target, you can either keep going (ie pushing for a further overclock) or stop and stress test at that point to ensure stability. Once, you have stability at a desired speed, you need to start minimizing voltages (ie decrease the voltage for a setting and stress test to see if stability is maintained).

    BTW, there is one more thing you should know. If you feel you are inexperienced at overclocking or need to completely minimize the risk of damaging your pc parts, you should follow the 15% rule. Essentially, if the most you increase any voltage over stock setting is by 15%, you run a very very low chance of any sort of long term damage (and especially of short term damage, which is what frightens most first timers the most). Its a good rule to follow and luckily most stable overclocks require much less than 15% increases in voltage over stock for any setting. Nonetheless, its something you should keep in the back of your mind because you may be at your 15% limit (usually when pushing for a maximal overclock) and know that your cpu still needs more vcore to run stably and you will have to decide if its worth it or if you need to back off. This is also why you generally don't want auto to determine your cpu pll and cpu vtt when overclocking; the boards seems to put in pretty wild values that are overkill for what you actually need.
    Last edited by Sunburn74; 09-24-2009 at 11:42 PM.

  10. #20
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    Default Re: Noob here tryin to OC my Q9550 for first time :D

    The basic bios settings in the first part of this post have provided stability to many setups and will give you a solid base for your overclock.

    The following shows the relationship between FSB, System Memory Multiplier and memory speeds.
    Substitute your FSB, multiply by each SMP and you'll see what memory speeds will be set.
    note: This table is for a P35-DS3L, which uses "+" and '~" SMP options that don't apply to your motherboard.

    Memory speed = Cpu host freqency X SMP (System Memory Multiplier).

    -cpu
    (MHz) X SMP = memory speed

    266-----2.00------533 MHz
    266-----2.40------638 MHz
    266-----2.50------667 MHz
    266-----2.66------709 MHz <-- probably not a P35 option
    266-----3.00------798 MHz
    266-----3.20------533 MHz
    266-----3.33------851 MHz
    266-----4.00+----1064 MHz
    266-----4.00~----1064 MHz
    note: + = 800 strap, ~ = 1066 strap, # = 1333 strap

    A mild overclock using cpu speed = 300MHz will yield:
    -cpu
    (MHz) X SMP = memory speed

    300-----2.00------600 MHz
    300-----2.40------720 MHz
    300-----2.50------750 MHz
    300-----2.66------800 MHz <-- probably not a P35 option
    300-----3.00------900 MHz
    300-----3.20------960 MHz
    300-----3.33-----1000 MHz
    300-----4.00+----1200 MHz
    300-----4.00~----1200 MHz

    This information was explained in some posts, but seeing a table like this helps to grasp the relationships.

    The B-strap is usable in the 3xx - 4xx FSB range.
    The D-strap should NOT be used with FSB less than 400MHz.
    Some have found that it's easier to get their overclocks stable when using the D-strap at 400MHz and above.

    I don't see your Memset, ET6, and cpuz (CPU and MAINBOARD) screen-shot in post #2.
    Please add a link to your ram's full specifications in your forum signature.
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