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  1. #1
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    Now to UNDO my overclock?

    I enjoyed learning to oc and was thrilled how much "extra performance" I could attain.

    Now, I've gone back to stock for a serious consideration of the thermals. At stock 3.9GHz my thermals hang around 40C. At oc to 4.5 to 4.7 I get thermals in the high 90Cs. Obviously, I could oc further and find Intel pulling back core multiplier to stay under Tj.

    I don't really appreciate the longterm effects of sustained thermals more than twice those of full load at stock. I just seems unnecessary wear, if indeed it accounts for wear.

    Short of sage advice from you, I think I will run the rig at stock until I find myself in a situation where the extra juice seems warranted. I still want to rethink the cooling to some degree; I want to exchange a 230mm for the temporary 200mm fan, and I want to replace those LOUD Corsair fans that came with the H100. I'll recheck the thermal profiles at that point, but my suspicion is heat is a cumulative corrosive that will ultimately bleed away the life of my lovely new i7 and Z77.

    Thoughts?

    PS: I'm planning to wander to a different thread to query recommendations for those push/pull horizontal 120mm fans I'm shopping for, but feel free to offer that advice. So far, I think I understand that high pressure fans will be better than high airflow for this purpose, that there are bearing types that work better vertical and others that work better horizontal. I have a Corsair 120mm AF as exhaust, I'm liking it, so I'm considering the Corsair SP fans.
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  2. #2
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    Re: Now to UNDO my overclock?

    You have discovered the dark side of OC'ing, to reach higher Mhz ratings you MUST increase the core voltage, the two go hand in hand. You are correct in that higher static pressure fans, at least with your system and the fin per inch count of the radiator and in a push/pull configuration, will help and should lower your temps to a more livable level. With the H-100 I think that mid 70c should be reachable.
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  3. #3
    Joined
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    Re: Now to UNDO my overclock?

    Thanks for the reply.

    With the H100 on Max/Turbo with the push/pull and edging back the voltage a bit from the ASUS automatic increase for the ratio bump, I think I got stable 70C at 4.5GHz 100% load via 8 threads of Prime95. Still, when I added twin GTX 460s pegged at 97-99% the cores/pkg temps rose to high 80Cs and the mobo started reading around 50C.

    I could easily get 4.8GHz from the i7 with mid 80Cs on the cores and only 40C or so on the mobo. Then adding the discreet GPU the i7 temps rose to 100C and the mobo was just shy of 60C.

    Some of this is ambient temps in the case, I suppose. I think the real problem is the mobo increasing voltages all round in response to the heavy load to the PCI bus. When I tried to reduce the VCore to the level it had been without the GPU load, then the voltage dips and surges of allowing the core ratio to rise and fall according to demand left the system unstable. I played with turning off the Turbo Boost but then I'm really just creating a small space heater as much as a computer. I don't really see the point as yet.

    Maybe... at some point I will find myself in a battle royale and decide to pull out all the stops.

    As I say, I will run through the thermals again when I upgrade the fans. I'll be a lot more familiar then and my data will probably be much better. Anyway I look at though, this is quite a fun toy and I'm tickled to have the opportunity to treat myself.
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  4. #4
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    Re: Now to UNDO my overclock?

    If you are using auto voltage increases, that might be a large part of your problem. Those increases tend to be VERY generous, and in fact your rig will almost certainly run just as well on lower voltages. In addition, "Auto" tends to bump up all the secondary voltages as well as Vcore, which adds yet more heat.

    When I overclock, I start with setting all the voltages to manual at default speed, and test stability for a few days. Once I'm happy that works, I increase speed slowly, stopping every 100-200MHz for at least 24 hours. As well as checking stability, it gives me a chance to see what temperatures are being reached. I increase voltages if there is instability, but not otherwise. Once increased, I test again for 24 hours. If you did the same, you'd have a might tighter control over voltages, and you'd be able to stop when you felt the temps were high enough.

  5. #5
    Joined
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    Re: Now to UNDO my overclock?

    What I seemed to find is if I set the voltages to manual I get the same voltage at idle as at load.

    Yes, I got a nice stable overclock at over 4.8GHz and I was able to adjust the voltages to minimize the heat. However, then I had to choose concerning Turbo Boost. I could turn off Turbo Boost and this meant I had the CPU working at something like 1.6GHz or 4.8Gz and nothing in between, and since the voltage was manual I was pushing something like 1.235v VCore even when idle. If I had the Turbo Boost on, then I had the issue of voltage drop when the core ratio changed. Like if the speed was changing from say 4.2GHz to 4.8GHz in response to a change in load there is a temporary sag in voltage as the system adjusts to the new load. In Auto voltage there is an automatic bump in the voltage to offset this necessary sag, but in manual the voltage is constant and therefore actually has greater variance at the higher clocks than at the lower ones. In order to maintain stability and use the Turbo Boost I have to push more voltage.
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  6. #6
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    Re: Now to UNDO my overclock?

    mickleby> Look through your bios and see if there is any sort of LLC, Load Line Calibration, that will allow the bios to adjust the Vcore for how ever much load you put the system under. Getting that set properly is more or less a matter of trial and error.
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  7. #7
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    Re: Now to UNDO my overclock?

    so if I set the LLC higher I get more juice at each ratio increase than with the LLC set lower? Or another way, the higher the LLC the broader the range of voltages applied in response to CPU load?

    How do I configure the response to the temporary voltage drop/surge at each new level of load? It seemed what I found was at lower voltages these minor perturbations had more significant impact on stability. Or another way, it seemed that I need voltage higher than needed for a steady load to offset the dip that occurs as the load changes.
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  8. #8
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    Re: Now to UNDO my overclock?

    I'm not that knowledgeable about Intel systems so I don't know if there is any adjustments for response times, but yes the higher the % the more voltage you'll get to compensate for loads. Like I said, it's more of a trial and error to get it balanced for your system.
    Electronic Smoke Signals From my "Techno Teepee"
    ASUS Crosshair V Formula AM3+ 990FX, 1703 bios
    AMD FX 8350 Vishera @ 5142Mhz [21x244] 1.536v
    Water Cooled - Koolance EX2-1055, CPU 370 WB, Idle=22c Load=53c
    32Gb G.Skill Sniper ddr3 1600 8G X 4 , 9-9-9-24 @ 1.55v
    ASUS HD7970-DC2T-3GD5, Cat 13.6 beta 2, Dell U3011 @ 2560x1600
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  9. #9
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    Re: Now to UNDO my overclock?

    How about on this point: My system will last longer at lower temps?

    If Intel says Tj is 105C can I run at 104C with no worries? Or, will running at around 40C mean I get a much longer life from these components? What's the sweet spot? 70C? 80C?

    On the other hand, one has to wonder how much life one want's from a system. I have two laptops on the shelf now. They aren't "classics" per se, so there's not much value from that perspective; and, they are so far behind the contemporary baseline of performance that I wouldn't even give them to a family member except for temporary emergency use.

    Still, an overclocked Ivy Bridge rig will probably lose value faster from size/weight than from sheer performance. 2400MHz RAM and 4.5GHz is well beyond the midrange performance specs of today.
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  10. #10
    Joined
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    Re: Now to UNDO my overclock?

    Quote Originally Posted by mickleby View Post
    How about on this point: My system will last longer at lower temps?
    I have run my SB rig @ 4.5 100% load (folding) since I put the rig together.

    During the summer months 75-80c continuous is not unheard of (air cooling)
    Winter...significantly lower temps.

    By the time the processor "goes belly up" I'd be ready to move on to another.

    I have some of my older rigs that had seen 100% load 24x7 re purposed into storage/streaming servers, hand me downs to other family members etc.

    No issues to speak of. (other than picnic errors)

    With that being said, unless you are worried about the extra power draw overclocking requires....I wouldn't worry about it.


  11. #11
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    Re: Now to UNDO my overclock?

    I know to get back to stock speeds I pretty much lower whichever variables I raised to overclock, Fsb, voltage, timings whatever depending on which computer...............On some you can set it in the bios, simple.........
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  12. #12
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    Re: Now to UNDO my overclock?

    As far as higher temps killing life span. yes that is true, but by the time a silicon chip dies from heat it will be obsolete anyways.

    Yeah you run at stocks with no voltage bump and in theory a chip can last 100 to 200 years, kill it with heat and bump it down to 10 years maybe? So what. As long as your below TDP and not crashing I wouldn't worry about it. If noise bothers you get fan controller, its what I use.

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