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Do I need a new PSU?

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  • Do I need a new PSU?

    Quick question for you guys!

    My current PC is in my signature, currently I have a 700W OCZ StealthXStream power supply.

    I'm looking to grab a second 7970 for crossfire, do you think I will need to get a new PSU? If so, can you recommend one? I don't intend to overclock the 7970s (they will have small factory overclocks), but may want to overclock the i5 2500k in the future (probably to 4 GHz if at all).

    Also, if I'm getting a new PSU, I'd like at least a semi-modular one. Not sure if there's much difference between the Bronze/Gold ratings etc.
    i5 2500k | 16GB RAM | Sapphire R9 290 Tri-X OC | 256GB + 240GB SSDs | 1TB + 3TB HDDs | Define R5 Black | Dell 27" 1440p 60Hz + BenQ 24" 1080p 144Hz

  • #2
    might be pushing it a little with 700w

    my 7950's pull 650w during gaming with 4770k 6 fans 2 ssd an waterpump


    750w during coin mining

    4770k @ 4.6, XSPC Raystorm, Avexir 4x4GB 2400MHz, ASUS Z87 Maximus Hero VI, Tri-fire 290x/290x/290 Reference EK 290X CSQ Full Nickel Blocks, Alphacool 240 ST-30, Alphacool 360 ST-30, Asus Xonar, Alphacool D5, Corsair AX 1200i, Carbide 540

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    • #3
      Originally posted by k3vst3r View Post
      might be pushing it a little with 700w

      my 7950's pull 650w during gaming with 4770k 6 fans 2 ssd an waterpump


      750w during coin mining
      Thanks for the info.

      Whats the worst case scenario? Will the PC just shut down if the power is too low or do I risk frying the PSU and/or components?
      i5 2500k | 16GB RAM | Sapphire R9 290 Tri-X OC | 256GB + 240GB SSDs | 1TB + 3TB HDDs | Define R5 Black | Dell 27" 1440p 60Hz + BenQ 24" 1080p 144Hz

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      • #4
        Tbh anything can happen, but mostly get random BSOD when gaming or doing any heavy work, its may overheat and shut down, best bet would be to use a PSU calculator to get a rough idea where your at, and dont forget Ampage on the 12v rail is just as important, the difference between bronze and gold etc is the efficiency, clean pull less ripples etc, and again depends on what 7970 they are too, some use more power than others, i always get 200 watts more than i need just for good measure, and to compensate for ageing capacitors, and because you never know what you might add next, so saves money in the long run

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        • #5
          System does not work with power.

          PSU rule applies:

          If in doubt - upgrade.



          All your spoon are belong to us

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          • #6
            Okay I used a power supply calculator and the result was 750W.

            So what do you guys think of this XFX 850W one:

            http://products.xfxforce.com/en-gb/P...U/P1-850X-XXB9
            i5 2500k | 16GB RAM | Sapphire R9 290 Tri-X OC | 256GB + 240GB SSDs | 1TB + 3TB HDDs | Define R5 Black | Dell 27" 1440p 60Hz + BenQ 24" 1080p 144Hz

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            • #7
              good choice, however, Aria has 3 subtly different XFX units, so review each ones capabilities and differences and see which fits best. Also as you go up the price range, then those three models straddle the very capable BEquiet 850w model.

              850W XFX Pro Core Edition 80PLUS Bronze - 83.48 ..... SKU: P1-850S-NLB9 - [Review 1] [Review 2]

              850W XFX Pro XXX Edition 80PLUS Bronze Modular - 87.73 ..... SKU: P1-850X-XXB9 - [Review 1] [Review 2]

              850W XFX Pro Black Edition 80PLUS Gold Modular - 115.06 ..... SKU: P1-850B-BEFX - [Review 1] [Review 2]


              850W be quiet! Power Zone 80PLUS Bronze Modular - 107.97 ..... SKU: BN212 - [Review 1] [Review 2 (650/750w versions)]


              Also consider the efficiency rating, but don't make your decision based solely on that, but it may be worth the few pounds extra to go to gold rating and save a small amount during use, whilst perhaps getting smoother power delivery rails.


              Review Database for PSU's giving other useful info, like OEM's for each units.

              PSU REVIEW DATABASE - XFX

              PSU REVIEW DATABASE - BE Quiet!



              Happy reading !! .... as you can see from the BE quiet ! table listed above, they do quite a few different ranges, the Power-Zone range is not the cheapest, but is also not their top flight model, and is only Bronze rated at over 100, still read the reviews and see what they have to say

              "Finally, we will access, disclose and preserve personal data, including your content (such as the content of your emails, other private communications or files in private folders), when we have a good faith belief that doing so is necessary"
              - EPIC EULA M$ !...... thanks, but no thanks! - GWX Control Panel

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              • #8
                Thanks Gunslinger, I went for the "850W XFX Pro XXX Edition 80PLUS Bronze Modular" in the end, seemed up to the job Got it alongside a shiny new Fractal Design R4 as a Christmas present to myself! Now I just need to source a second 7970 on the cheap...
                i5 2500k | 16GB RAM | Sapphire R9 290 Tri-X OC | 256GB + 240GB SSDs | 1TB + 3TB HDDs | Define R5 Black | Dell 27" 1440p 60Hz + BenQ 24" 1080p 144Hz

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