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Underclock too much could damage video card?

Discussion in 'Graphics Cards' started by Derek12, Nov 16, 2010.

  1. Derek12

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    I would want to underclock my video card to the lowest core/shader clock values while I'm not gaming (162MHz/800MHz). Could this be bad for it? I've tried and I don't notice great performance penalties in 2D but I'm not sure if could damage the card so I returned to the default values until I comfirm this underclock is safe.
    Using EasyTuner 6.
    Many thanks.
  2. toastem2004

    toastem2004

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    If your still putting "stock" voltage through it, then maybe. With the lowering of the speeds, lowing of the voltage is also recommended. just as when overclocking more voltage is usually required. A good example of this is Cool n quiet. On a Turion ml-32 @1.8GHz, voltage is 1.35 & when it down clocks to 800MHz, voltage is now 0.925
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  3. newtekie1

    newtekie1 Semi-Retired Folder

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    It will be completely safe, though it won't do a whole lot and there isn't much reason for it. Now if you lowered the clocks and the volage that would save you some power, but just lowering the clocks won't save much at all.
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  4. Derek12

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    OK Many thanks, my card is factory-overclocked, then I will simply remove that overclock.

    BTW Easy Tune 6 doesn't let me to alter the GPU voltages only the Shader/core/memory clocks
    Many thanks

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  5. hat

    hat Maximum Overclocker

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    I wouldn't worry about it. You have a 9500gt... you're not going to save very much power no matter what you do with it.
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  6. Derek12

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    Why?
    Thanks
  7. Bo$$

    Bo$$ Lab Extraordinaire

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    it doesnt use too much in the first place :laugh:
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  8. Tatty_One

    Tatty_One Senior Moderator Staff Member

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    As has been mentioned, the 9500GT is in reality a low power consuming GPu in any case, I think the default voltage to the GPU is 1.00V and many 9500's don't actually have different 2D and 3D clocks because simply there is little to gain from the savings in the first place, I think idle draw on the overclocked version is only around 95W.

    Of course you can set/lower 2D clocks and voltage via a bios flash, just make sure you don't get over ambitious with lowering the voltage, even in 2D many GPU's have a minimum operating voltage and if you go too low, either on clocks or voltage the card will begin to stutter, much like a car that pulls away without sufficient foot being applied to the accelerator, you know when it does the "donkey" jerks often seen with new drivers because it aint getting enough gas and/or revs :laugh:
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  9. hat

    hat Maximum Overclocker

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    I don't think that's right. 95w idle is horrific for any card, even a 5970.
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  10. qubit

    qubit Overclocked quantum bit

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    Underclocking your card will definitely not damage it, as others have stated here. Whether it's worth doing on your low power card is another matter.

    Note that as you reduce the clock speed, you will notice a slowdown even in desktop 2D performance and if you go down low enough, it will malfunction when trying to display high resolutions, but it won't be damaged.

    This partial loss of functionality will also occur if you lower the voltage too much.

    Note that the Aero interface actually keeps the card in 3D mode to render its effects.
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  11. Tatty_One

    Tatty_One Senior Moderator Staff Member

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    I think it is........................

    http://www.techpowerup.com/reviews/Galaxy/GeForce_9500_GT_Overclocked/24.html

    thats for the galaxy, i was looking earlier at the EVGA OC version which clocks a little higher and therefore is 95W, remember these cards are 65nm (Rev 1 release, later releases went 55nm) process NOT 40nm like most of the more modern cards........ so i suppose it would be more accurate to say, "they are relatively low power consumption cards for the 65nm process". if you compare it with the GTX 260 65nm then you are seeing an additional 20W consumption at idle for the 260, that accelerates to hhhuuuggggeeee amounts at load and max.
    Last edited: Nov 17, 2010
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  12. the54thvoid

    the54thvoid

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    Good god. To think all this time we've been moaning about power draw of the gtx 480's. Puts it into perspective.
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  13. Black Panther

    Black Panther Senior Moderator™ Staff Member

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    5970 draws only 39W @ idle ;)

    (the maximum would be another story... say double the 150W of the 9500GT's maximum)

    On topic though, I'd say if the OP manages to reduce his idle power consumption it isn't a bad idea.
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  14. Jizzler

    Jizzler

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    I was able to reduce the draw from the wall by about 10w from adjusting voltage/clocks of my old 8600GTS. Only had two options for voltages, so I only gained so much.

    Now that I think of it, one my frankenboxes has a 9500GT in it. Time for tests!
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  15. Derek12

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    Many thanks for your answers
    I want to underclock it to make my system noiseless and to reduce electrical bill, I enabled Cool and Quiet and Smart Fan (a year and a half that my computer has and I didn't know this feature and the noise level decreased).
    The next step is the video card. I know my MB has fanless onboard video but it is very bad for games and videos and stealts my limited RAM memory so I decided to put a dedicated one.
    The next step would be a SSD drive, a VERY long-term goal :(
    BTW I have played CoD 4 MW with 500 MHz and 1350 MHz shader and the GPU temp didn't go above 40ºC so I think the underclocking is reducing the temps (and maybe power consumption)
  16. HalfAHertz

    HalfAHertz

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    You have to remember that those results are old and show the power for the entire PC
  17. Tatty_One

    Tatty_One Senior Moderator Staff Member

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    In our reviews it shows card only draw, not whole system draw.
  18. Derek12

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    BTW Tatty_One the 95 W is the whole computer idle consumption (The table says "System power consumption - idle ", the card's idle consumption is 20 W and the load one is 40 W
    The article also says "In order to characterize a video card's power consumption, the whole system's mains power draw was measured. This means that these numbers include CPU, Memory, HDD, Video card and PSU inefficiency."

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    Last edited: Nov 18, 2010
  19. hat

    hat Maximum Overclocker

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    Yeah, I would buy 95w for entire system idle power draw, but not for the card alone. The 9500GT doesn't have a power connector, so it can draw at most 75w from the slot. It's just not possible for it to idle at 95w... that could possibly break the board, nevermind the power it would draw at load if 95w was indeed it's idle power draw.
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  20. Tatty_One

    Tatty_One Senior Moderator Staff Member

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    Ahhhh right, my apologies, I didnt see how that could possibly be full system draw at idle seeing as that review had an E8400 overclocked to 3.6 gig, now the TDP of a stock E8400 is 65W, so the review chip was overclocked by 20%, that knocks the TDP up to around 80W, now if you add 20W for the card (100W), throw in a motherboard, a HDD, some ram and fans then clearly my math is bad because i don't see for the life of me how that equals 91W. :confused:
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  21. heky

    heky

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    @Tatty_One
    Its in idle, an E8400 doesnt consume 65W at idle, even overclocked. At load yeah, but not idle.
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  22. Tatty_One

    Tatty_One Senior Moderator Staff Member

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    Good point, of course thats "max" TDP rating, my bad, i will go back to sleep now! :eek: even less reason for the op to bother risking a flash for a card that consummes so little TBH.
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  23. Mussels

    Mussels Moderprator Staff Member

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    you have now been learneded.


    Derek12:

    unlike your CPU with cool and quiet, there is no guarantee that lowering the temps on your video card will actually decrease noise. the fan could well be hardwired and NOT temperature controlled at all, so lowering temps makes it stay just as loud.


    Perhaps look into a replacement GPU cooler instead.
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  24. qubit

    qubit Overclocked quantum bit

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    Or the silly fan could perhaps make the perfect "business case" for a brand new better graphics card. ;) :D
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  25. Derek12

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    I left the card finally in 490 GPU, 1300 Shader, 500 memory (this one is default) and I ran Resident Evil 5 benchmark DX10 mode, Unigine Heaven DX10 and the max temp reached is 40 º so I think the underclocking has some effect anyway and I didn't notice major performance issues so far (all the setting were max except AA which was 2X :)

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