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Thread: GPU power consumption and PSU

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    Default GPU power consumption and PSU

    I have been drooling over to buy a Gigabyte GTX 970 Windforce OC since @VANGUARD posted its recently lowered price. Yesterday he suggested that should book it cause the stocks may not last. So today I did a feasibility study over the prospectus of buying GTX 970.

    So I started to check my current system and what else I may need to buy to run the GTX 970.

    First thing which I will have to change is my Casing, which cannot house a 12+inch card. So after a lot of researching I found out that CM N200/N400 are the cheapest Casing which I would need to buy to house the GTX 970 and it would cost me between Tk 3600-3800.

    Secondly my CPU is not powerful enough to run GTX 970 to its full potential, but I can easily change my i3 with and i5 in the future.

    For hours I was quite sure my analysis is complete and rest of my system will be fully fictional with GTX 970.

    As I kept staring at the product's page on the Gigabyte's website, sometime caught my eye. Gigabyte GTX 970 Windforce OC has a 6 pin and a 8 pin external power connector. The GPU has a TDP of just over 170 watts. So why does it have a 8 pin connector? PCI-e supplies 75w, 6 pin supplies 75w and 8 pin supplies 150w; that's a total of 300w.

    Now wait a sec? Why would Gigabyte do this? Did their engineers made a mistake? Well I did some digging and found out no they haven't.

    Gigabyte GTX 970 Windforce OC draws over 300w at peak loads while gaming, while the TDP is nothing but a mere average

    Click image for larger version. 

Name:	GTX970PC.jpg 
Views:	1376 
Size:	210.7 KB 
ID:	36692

    As you can see by looking at the picture that over 60secs the card draws over 300w quite a few times. All of a sudden my PSU, Corsair VS 450, which I have previous boosted to be sufficient to run GTX 970, here in BG forums, now seems very doubtful. If somehow my entire system decides to draw at its peak at the same time while running a GTX 970, it might go over 400w which I feel is too close for comfort. Corsair VS 450 is a good PSU but not good enough for me to have the confidence to push it to its limit.

    I know a lot of BG members were confident in the past, but what do you think of it now?
    Is there anything I am still oblivious of? Please share your knowledge, I will be grateful.

  2. #2
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    First of all- I said this many times in this forum and many tech geeks in this forum did not agree with me on this point- TDP is nothing but a lie. If you are trusting TDP which is officially declared by the companies(you can always trust those companies right? ) you are doing it wrong. You want prove? Nvidia did lie about their maximum power consumption about their old gtx series(gtx 200 series). also Nvidia gtx 550Ti was very power hungry... but officialy TDP was only 115watt... in reality it took nearly 150watt when gaming with full load. at this moment I can't specifically remember if amd lied about their gpu consumption, but i think they probably did.
    i remember Vanguard became very furious at 550Ti power consumption controversy and told everyone not to buy it.

    what i am saying is never trust those companies. because if they could legally rob your wallet, they would happily do it
    always look at reviews (from unbiased reviewers of hardocp guru3d anandtech techpowerup)
    You know why I am so fond of unbiased reviewers? because if they did not exist pc gaming would not exist in 2015, we would probably play on xbone or ps4 right now.
    I hope this is the last time i said that in this forum because i am tired to hear 'hey this doesnt match official statement i am so surpised wow' well it was not meant to match the official statement, what type of world you think you are living in??



    now ON TOPIC-

    http://www.techpowerup.com/reviews/M...Gaming/25.html

    it says gtx 970 takes upto 200watt at maxium.


    but wait, power consumption of different version of a gpu may and will be totally different. for example- my 280x vapor-x which is 7970Ghz Vapor-x can consume upto 380watt while gaming in full load (when overclock) where a normal 280x will only take ~270w in full load.

    now, http://www.legionhardware.com/articl...gtx_980,9.html

    here they are saying 970 g1 gaming can take upto 280w which is a lot.

    also the tomshardware link which you shared- http://www.tomshardware.co.uk/nvidia...-33038-12.html


    and about pcie cords... well it doesnt matter if your card has 8pin power port or not. just because something can take all your money doesnt mean it will always take all your money (well usually they do so it's a bad example )



    also please note that benchmark tests like fumark require much more power than gaming at full load... but those were not fumark tests because reviewers said so.


    also- if you like what i am saying- always disbelieve official statements of these companies- comment :y:
    and if you think nobody should always disbelieve statements- comment too. i am really furious right now so i want to play a deathmatch against these noob official statement lovers once and for all. it's either me or you guys. http://www.quickmeme.com/meme/3r8obc
    Last edited by furiousTaher; July 12th, 2015 at 21:19.

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    Damn my card was an ECS 550 Ti , but sold that ¤¤¤¤ and now using a cheap a$$ HD 6570. Also know one thing, Factory overclocked 900 Series have way more power consumption cause I noticed overclocking increases its substantially

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    Quote Originally Posted by Trave160 View Post
    Damn my card was an ECS 550 Ti , but sold that ¤¤¤¤ and now using a cheap a$$ HD 6570. Also know one thing, Factory overclocked 900 Series have way more power consumption cause I noticed overclocking increases its substantially
    wait... isnt 550Ti wayyy more superior than 6570

    - - - Updated - - -

    ya overclocked grphics card always take way more power than stock one... for 900 series its even more significant becuase 900 series has a great oc potential.

    - - - Updated - - -

    little off topic:

    As far I can tell-
    guru3d hardocp are the best review sites. (tier 1)

    are sites like techpowerup andantech tomshardware as good as tier 1 sites?

    vanguard romulus bros

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    Quote Originally Posted by furiousTaher View Post
    wait... isnt 550Ti wayyy more superior than 6570
    Was suppose to get a new computer but plans were postponed so for university work and low level gaming I have to use this no other choice

  6. #6
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    Quote Originally Posted by Trave160 View Post
    Was suppose to get a new computer but plans were postponed so for university work and low level gaming I have to use this no other choice
    you have xbox one right?

  7. #7
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    Quote Originally Posted by furiousTaher View Post
    you have xbox one right?
    I didn't buy the damn thing yet, planning to at Black Friday sells

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    Quote Originally Posted by mithun12ka4 View Post
    I have been drooling over to buy a Gigabyte GTX 970 Windforce OC since @VANGUARD posted its recently lowered price. Yesterday he suggested that should book it cause the stocks may not last. So today I did a feasibility study over the prospectus of buying GTX 970.

    So I started to check my current system and what else I may need to buy to run the GTX 970.

    First thing which I will have to change is my Casing, which cannot house a 12+inch card. So after a lot of researching I found out that CM N200/N400 are the cheapest Casing which I would need to buy to house the GTX 970 and it would cost me between Tk 3600-3800.

    Secondly my CPU is not powerful enough to run GTX 970 to its full potential, but I can easily change my i3 with and i5 in the future.

    For hours I was quite sure my analysis is complete and rest of my system will be fully fictional with GTX 970.

    As I kept staring at the product's page on the Gigabyte's website, sometime caught my eye. Gigabyte GTX 970 Windforce OC has a 6 pin and a 8 pin external power connector. The GPU has a TDP of just over 170 watts. So why does it have a 8 pin connector? PCI-e supplies 75w, 6 pin supplies 75w and 8 pin supplies 150w; that's a total of 300w.

    Now wait a sec? Why would Gigabyte do this? Did their engineers made a mistake? Well I did some digging and found out no they haven't.

    Gigabyte GTX 970 Windforce OC draws over 300w at peak loads while gaming, while the TDP is nothing but a mere average

    Click image for larger version. 

Name:	GTX970PC.jpg 
Views:	1376 
Size:	210.7 KB 
ID:	36692

    As you can see by looking at the picture that over 60secs the card draws over 300w quite a few times. All of a sudden my PSU, Corsair VS 450, which I have previous boosted to be sufficient to run GTX 970, here in BG forums, now seems very doubtful. If somehow my entire system decides to draw at its peak at the same time while running a GTX 970, it might go over 400w which I feel is too close for comfort. Corsair VS 450 is a good PSU but not good enough for me to have the confidence to push it to its limit.

    I know a lot of BG members were confident in the past, but what do you think of it now?
    Is there anything I am still oblivious of? Please share your knowledge, I will be grateful.
    TDP and Power Consumption is not the same thing. Research it properly and you will get your answer. Bye.
    Last edited by VANGUARD; July 12th, 2015 at 22:46.

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    @furiousTaher

    Tdp is more of a heat dissipation in watts and not reflect actual power consumption.
    so yeah you are right about the fact that TDP dosen't mean actual power draw. Rather It should be used to calculate how much cooling capacity is required to dissipate heat in order to keep the chip operating below the given nominal tcase value.

    Problem is, there is no standardized test that you can use to compare one chip to another. ( intel/amd/nvidia)

    interestingly, Nvidia came up with its own definition of TDP.

    I would say TDP can be used as an abstract reference point based on which PSU/ups power req can be calculated.

    This is why its always a good idea to have a extra headroom when you decide on psu/ups. I personally prefer doing the necessary test to figure out power draw in my setup due to fair share of my skepticism against the review sites. Not saying all of them are bad.

    For regular users who have no way of measuring power draw, they can atleast use TDP value a reference point.

    The logic is that the amount of power that is been drawn is mostly put out in terms of heat. So, TDP can be an approximation of power draw but definitely is not equal to actual power draw.

    TDP (in Watts) FurMark (in Watts)
    Radeon HD 4870 160 187
    Radeon HD 4870 X2 286 373
    Radeon HD 3870 105 123
    GeForce GTX 295 289 316
    GeForce GTX 280 236 226
    GeForce 9800 GTX 156 186


    and I would not call "TDP" a lie though. OEM's arse would've been sued if it was a balant lie. they have their arse covered.
    Last edited by minitt; July 12th, 2015 at 22:57.

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    Quote Originally Posted by minitt View Post
    @furiousTaher

    Tdp is more of a heat dissipation in watts and not reflect actual power consumption.
    so yeah you are right about the fact that TDP dosen't mean actual power draw. Rather It should be used to calculate how much cooling capacity is required to dissipate heat in order to keep the chip operating below the given nominal tcase value.

    Problem is, there is no standardized test that you can use to compare one chip to another. ( intel/amd/nvidia)

    interestingly, Nvidia came up with its own definition of TDP.

    I would say TDP can be used as an abstract reference point based on which PSU/ups power req can be calculated.

    This is why its always a good idea to have a extra headroom when you decide on psu/ups. I personally prefer doing the necessary test to figure out power draw in my setup due to fair share of my skepticism against the review sites. Not saying all of them are bad.

    For regular users who have no way of measuring power draw, they can atleast use TDP value a reference point.

    The logic is that the amount of power that is been drawn is mostly put out in terms of heat. So, TDP can be an approximation of power draw but definitely is not equal to actual power draw.

    TDP (in Watts) FurMark (in Watts)
    Radeon HD 4870 160 187
    Radeon HD 4870 X2 286 373
    Radeon HD 3870 105 123
    GeForce GTX 295 289 316
    GeForce GTX 280 236 226
    GeForce 9800 GTX 156 186


    and I would not call "TDP" a lie though. OEM's arse would've been sued if it was a balant lie. they have their arse covered.

    I expected the power consumption of GTX 970 WFOC to be more than 170w... I thought it would peak at 220w-230w even may be 250w. But if u look at the Picture you will see there are instances where it will reach near 350w. Thats what surprised me the most and made me doubt my PSU.

    - - - Updated - - -

    Quote Originally Posted by VANGUARD View Post
    TDP and Power Consumption is not the same thing. Research it properly and you will get your answer. Bye.
    Bro in so many threads both you and I have supported the idea of Corsair VS 450 being sufficient for GTX 970. I even believed it without a shadow of a doubt till yesterday. Even you said a year back and i quote "No matter how much you overclock you do, a single GTX970 CANNOT consume more than 145w-180w itself."

    But after all this time and experience, where does your opinion stand? How much does these peaks affects the PSU? How much do you think the GTX 970 consumes?

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    accha tt litepower lp 500nl1nh refurbished kemon cholbe??
    gtx960 kintesi

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    Quote Originally Posted by mithun12ka4 View Post

    Bro in so many threads both you and I have supported the idea of Corsair VS 450 being sufficient for GTX 970. I even believed it without a shadow of a doubt till yesterday. Even you said a year back and i quote "No matter how much you overclock you do, a single GTX970 CANNOT consume more than 145w-180w itself."

    But after all this time and experience, where does your opinion stand? How much does these peaks affects the PSU? How much do you think the GTX 970 consumes?
    thats a good question. i think vanguard was reading stock 970 benchmarks... stock 970 according to techpower does not take more than 200watt... ever. so i believe for stock 970 good 450watt psu will be enough. we all missed the part about overclocked graphics card... and i think many guys from different forums always forget this important point too.

    and for this case good 550w psu will be enough because oc 970 does not take more than 300w

    - - - Updated - - -

    Quote Originally Posted by minitt View Post
    interestingly, Nvidia came up with its own definition of TDP.
    oh wait, i didnt know that :O

    what's that?


    Quote Originally Posted by minitt View Post

    TDP (in Watts) FurMark (in Watts)
    Radeon HD 4870 160 187
    Radeon HD 4870 X2 286 373
    Radeon HD 3870 105 123
    GeForce GTX 295 289 316
    GeForce GTX 280 236 226
    GeForce 9800 GTX 156 186
    thnx for sharing this but for many cards the difference between TDP vs max power draw is way more significant.

    Quote Originally Posted by minitt View Post
    and I would not call "TDP" a lie though. OEM's arse would've been sued if it was a balant lie. they have their arse covered.
    you sure they did not come up with their own definition of 'lie'?

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    Quote Originally Posted by furiousTaher View Post
    thats a good question. i think vanguard was reading stock 970 benchmarks... stock 970 according to techpower does not take more than 200watt... ever. so i believe for stock 970 good 450watt psu will be enough. we all missed the part about overclocked graphics card... and i think many guys from different forums always forget this important point too.

    and for this case good 550w psu will be enough because oc 970 does not take more than 300w
    i did not read any benchmark. I did the simple calculation, a card with two 6 pin pcie connector cannot consume more than 225w.

    - - - Updated - - -

    Quote Originally Posted by mithun12ka4 View Post
    I expected the power consumption of GTX 970 WFOC to be more than 170w... I thought it would peak at 220w-230w even may be 250w. But if u look at the Picture you will see there are instances where it will reach near 350w. Thats what surprised me the most and made me doubt my PSU.

    - - - Updated - - -



    Bro in so many threads both you and I have supported the idea of Corsair VS 450 being sufficient for GTX 970. I even believed it without a shadow of a doubt till yesterday. Even you said a year back and i quote "No matter how much you overclock you do, a single GTX970 CANNOT consume more than 145w-180w itself."

    But after all this time and experience, where does your opinion stand? How much does these peaks affects the PSU? How much do you think the GTX 970 consumes?
    If you also look carefully, the card i was talking about did NOT have any 8pin connector.

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    Quote Originally Posted by furiousTaher View Post
    thats a good question. i think vanguard was reading stock 970 benchmarks... stock 970 according to techpower does not take more than 200watt... ever. so i believe for stock 970 good 450watt psu will be enough. we all missed the part about overclocked graphics card... and i think many guys from different forums always forget this important point too.

    and for this case good 550w psu will be enough because oc 970 does not take more than 300w
    Did techpower used oscilloscope ? Because before Tom's Hardware actually used it, every benchmark site said that G1 Gaming wouldn't take more than 250w. That is because such peaks would last only fraction of a second. Therefore the only way to see them is using oscilloscope. Other form of devices would not register such peaks at all. Which is why we all supported the idea of GTX970 OC not drawing more than 180w. But now that we have these new data, we are doubting it.

    I really dont know if such peaks which lasts for fraction of a second affects the psu or not.

    - - - Updated - - -

    Quote Originally Posted by VANGUARD View Post
    i did not read any benchmark. I did the simple calculation, a card with two 6 pin pcie connector cannot consume more than 225w.

    - - - Updated - - -



    If you also look carefully, the card i was talking about did NOT have any 8pin connector.
    Fine I agree, bro. But what does your experience say about GTX970 WFOC. How much would it need? How much does these peaks affects the PSU? Before when we were oblivious of existence of such peaks we never expected this.
    Last edited by mithun12ka4; July 13th, 2015 at 00:07.

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    Quote Originally Posted by mithun12ka4 View Post
    Did techpower used oscilloscope ? Because before Tom's Hardware actually used it, every benchmark site said that G1 Gaming wouldn't take more than 250w. That is because such peaks would last only fraction of a second. Therefore the only way to see them is using oscilloscope. Other form of devices would not register such peaks at all. Which is why we all supported the idea of GTX970 OC not drawing more than 180w. But now that we have these new data, we are doubting it.

    I really dont know if such peaks which lasts for fraction of a second affects the psu or not.
    Pretty much all the well made psu can provide more than its advertised power cap for a limited time before it shuts down itself.

    if budget permits always make your purchase based on maximum power draw calculation + xx % extra headroom to compensate component aging and future upgrade, oc

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    Quote Originally Posted by KING offspring View Post
    accha tt litepower lp 500nl1nh refurbished kemon cholbe??
    gtx960 kintesi
    get corsair vs or CX (500 watt or above) instead of TT lightpower just to be safe with gtx 960

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    I think there's been a misunderstanding of some sorts. Two 6 pins can draw up to 150W. The PCI E can draw up to 75W, but no sane manufacturer will pull more than 70W from the slot. Are you sure the power draw shown in the charts is not a comparison between the rig's power draw at IDLE and power draw during full load? If that's the case, then you'll have to measure the card's power draw by looking at the difference between the system at load, and the system at idle.

    Another thing that most people overlook is a GPU's ASIC rating. A GPU with a lower ASIC rating will leak more. And if you're comparing power draw measurements taken directly from the wall socket, the PSU's efficiency also comes into play.

    Edit: I see that the chart says it's measuring loads from all rails. So it's safe to assume that it points to the whole system's power draw, to back the point I made further.
    Last edited by Fox Mulder; July 13th, 2015 at 14:07.

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    Quote Originally Posted by Fox Mulder View Post
    I think there's been a misunderstanding of some sorts. Two 6 pins can draw up to 150W. The PCI E can draw up to 75W, but no sane manufacturer will pull more than 70W from the slot. Are you sure the power draw shown in the charts is not a comparison between the rig's power draw at IDLE and power draw during full load? If that's the case, then you'll have to measure the card's power draw by looking at the difference between the system at load, and the system at idle.

    according to http://www.tomshardware.co.uk/nvidia...-33038-12.html
    its gpu power consumption... but actually the power consumption while gaming is 250watt max... the spikes are going as high as 300w.

    also,,,, one of the chart is gpgpu benchmark not gaming...

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    I think I wasted my time once more.

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