570GTX and PSU

Discussion in 'Videocards - NVIDIA GeForce' started by Adeks, Oct 14, 2011.

  1. Adeks

    Adeks Member

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    Hello i just wonder if my PSU is enough for my card and rest of spec. Now its stable and i dont have any problem. My score in 3dmark 11 on stock 770/1000 is 5876 if i oc'ed gpu to 900 i have 6846 (this is only gpu score). I stress OCCT gpu on both clock no errors and in line V12 when clock is oc i have 12,46 stock 12,56 it is good?. And one thing i must underclocked my cpu from 3,6Ghz to 3,2Ghz to get it stable before when i have GTX460 1GB it was well soo mayby i change PSU??
     
  2. BlackZero

    BlackZero Ancient Guru

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    yes, your psu is on the low side for your setup, you'd need atleast a quality 650w minimum for long term stability with that OC or a 750w would be recommended to keep your power efficiency high, i.e the extra cost of the 750w over the 650watt would pay for itself due to the better power efficieny and you will have a better psu incase you ever wanted to upgrade to more powerfull components.
     
  3. lehtv

    lehtv Ancient Guru

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    @BlackZero

    I agree that 500W is on the low side for an overclocked 570, particularly with that OCZ psu. But disagree on other counts:

    Untrue. NVIDIA recommends 550W minimum for gtx570 and it's reasonable to assume that this recommendation takes into account average and perhaps low quality PSUs as well. A high quality 550W PSU would handle a GTX 570 in the long term, even if OC. 650W is by no means a minimum, it's more like optimal.

    It will most definitely not pay itself back. This is a very, very minor issue. On average you see PSU efficiency vary around 1-3% from 20% to 50% to 100% load (as dictated by 80Plus certification). That is not large enough variation to have any appreciable impact on your power bill even if you run the system for 5 years.

    In addition, a 750W PSU will output below 20% with the system in idle, and efficiency degrades quite a bit at such levels - not that his has much impact on the power bill either. But it does certainly offset any possible improvement in load efficiency between otherwise indentical 650W and 750W PSUs.

    More watts =/= better. However, this can be a reasonable consideration, but there are a couple things wrong with it too. Future hardware will use less power than current hardware, because that's where the tech is going. Secondly, if you have no plans for a SLI setup, there's no point paying for an overkill PSU. Finally 750W is barely enough for overclocked 570 SLI or similar, 850W would be optimal but certainly not worth paying for in advance.

    @Adeks

    I would sell the OCZ to someone who uses a less power hungry setup. Grab yourself a quality but not too costly 600-650W unit, e.g. Corsair CX600 V2, Corsair TX650 V2, Antec Neo Eco 620C, Antec EA650D, XFX Core 650.

    FYI, the +12V line is not all that stable on your OCZ, 12.56 is a 4.7% error. A maximum of 5% is allowed by the ATX specification... remember that this specification applies to all ATX power supplies, not just quality ones.
     
    Last edited: Oct 14, 2011
  4. XBEAST

    XBEAST Ancient Guru

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    Your PSU is getting very stressed. BZ is right. At least a quality 650W PSU is recommended for such system. GTX 570 eats up to 325-350W. This would leave about 300W for all other components and some free power so PSU isn't working at full load.


    CX600 V2 wouldn't be enough for such system, considering it has only 480W on +12V rail.
     
    Last edited: Oct 14, 2011

  5. BlackZero

    BlackZero Ancient Guru

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    Lehtv, his phenom when overclocked to 3.6-3.8Ghz will be using an extra 150w+ so yeah 650w is definately the minimum, it being a quality psu goes without say so don't know why you come up with the more watts doesn't help equation.

    Also at that overclock he's already pushing his psu to the point where he can't even overclock his cpu anymore so the extra 100w are only barely enough to maintain his system while pushing the psu to the max, at max load the psu isn't going to last long and the high temps mean the eficiency drops.

    For good efficiency and long term usage he will have use for the extra power of the 750w as it'll keep his efficiency to decent levels and the extra £20-30 cost will pay itslef back over the 3+ years he uses the psu even if it's only 5% better overall, not to mention the ability to add more components as noted.

    I hope you're not being argumentative again.
     
  6. Adeks

    Adeks Member

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    thanks all for help! :) Soo Corsair GS 700W CMPSU-700GEU it will be good?
     
  7. Agent-A01

    Agent-A01 Ancient Guru

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    Go with a TX650V2 or TX750V2 if you have the money for the latter.
     
  8. BlackZero

    BlackZero Ancient Guru

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    I'd pay the extra ~$10 and get the Corsair TX750.
     
  9. lehtv

    lehtv Ancient Guru

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    True.

    Alright since the CPU is that much overclocked, you have a point, 550W isn't really enough. However, 150W+ compared to stock clocks? Unlikely. It'll use around 100W more if it's at all comparable to 955 BE overclocking: http://www.neoseeker.com/Articles/Hardware/Reviews/pii955/13.html (125W TDP at stock) Is this not true?

    Let's crunch some numbers - his GTX570 once OC'd will use around 50W more than at stock clocks. Adds up to around 260W at load. Combined the CPU and GPU will use 225+260 = 485W at 100% load which practically never happens. That's 80% of a quality 650W power supply's 12V rail, which is perfectly fine. In a realistic load scenario he'll hover around 70%. With a 750W PSU, those numbers would be 70% and 60% respectively, which is alright too. With a less power hungry CPU it'd be overkill :thumbup:

    Hmm throwing a lot of numbers around here, how did you determine the extremely small difference in load efficiency between 650W and 750W PSUs would be enough to pay back the extra cost of a 750W PSU? share the calculations please ^^

    I hope that doesn't mean we can't have a rational discussion
     
  10. BlackZero

    BlackZero Ancient Guru

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    let's assume he uses 500w full load for 5 hours gaming a day, over 3 years.

    500 x5 x365 x3= 2, 737, 500 watts or 2737.5 Kw, at 80% efficiency that would be total power usage of 3422 Kw.

    Now let's assume he gets 5% better efficiency when using the 750w psu, then he's using 3650kw at 75% efficiency so he's saving (3650 - 3422) 228kw or at rate of 12 pence; £27.36.

    You could just as easily reduce the efficiencey difference to 3% or load power usage to 4 hours, and then assume the psu lasts 5 years (guarentee period for new psu's) and still get the same saving.
     

  11. ---TK---

    ---TK--- Ancient Guru

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    ^^^your slalker back? lol
     
  12. BlackZero

    BlackZero Ancient Guru

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  13. Adeks

    Adeks Member

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    So i want to buy Corsair GS 700W CMPSU-700GEU or OCZ ZS Series 80+ 750W witch one is better??
     
  14. Agent-A01

    Agent-A01 Ancient Guru

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    Neither. Just get the Corsair TX750V2.
     
  15. lehtv

    lehtv Ancient Guru

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    Let's not assume. The OC'd 570 and B55 will total 485W as a maximum, not as a practical average power consumption when gaming. The CPU in particular won't be stressed even near the maximum, and neither will GPU at all times. Sometimes it'll use much less than all of its capacity if the game isn't demanding, sometimes it'll fluctuate between 90%-99% in very demanding games. I would say 400-450W is a realistic estimation for average gaming power consumption, even when adding the motherboard/RAM into it.

    5% better you say? Where did you get that from? I did already state that the 80Plus specification dictates that the variation from 20% to 50% to 100% load can only be within 3%. For many PSUs, it is less, nearly 1%. A 500W load is 77% of 650W, and 66% of 750W. Do you really think that difference in load translates to a 5% difference in efficiency?

    Also I'm not sure why you're doing calculations with power supplies that aren't even 80Plus rated.
     
    Last edited: Oct 15, 2011

  16. BlackZero

    BlackZero Ancient Guru

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    You've been prooven wrong again and now you're just trolling so i'm not going to waste my time.
     
  17. lehtv

    lehtv Ancient Guru

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    What?

    No, I'm not trolling. I really don't see how you can get that impression.
     
  18. ---TK---

    ---TK--- Ancient Guru

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    Seriously. What do you have against BZ? He is a very knowledgeable and respected member here.
     
  19. lehtv

    lehtv Ancient Guru

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    Wrong question mate, I have absolutely nothing against him

    Not sure if you're trolling me.
     
  20. ---TK---

    ---TK--- Ancient Guru

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    not trolling just an observation. you sword fight him every chance you get, maybe because more often than not he is right. I have seen this in more threads than just this one.
     

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