620 watt PSU enough for 570GTX SLI?

Discussion in 'Newbie Lounge' started by rickross, May 9, 2012.

  1. rickross

    rickross Member

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    I've got a Corsair HX 620W PSU. I've just picked up two 570 GTXs, but just wondering if the PSU will be enough?

    Rest of the system:
    i5 2500k mild OC
    16gb RAM
    240Gb SSD HD
    1Tb WD greenpower HD
    SATA DVD writer
    Asus essence STX
    4x 120mm case fans
     
  2. HeXa

    HeXa Member

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    noooooooo

    a single 570 card by itself can pull up to 300W in some benches (about 200W gaming).
     
  3. mark_vr_limited

    mark_vr_limited Member

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    My old hx620 ran the system in my sig. It ran really well even with the power hungry gtx295. It would be close running the 2 gtx570's.
     
  4. O-B-E-L-I-X

    O-B-E-L-I-X Member

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  5. HeXa

    HeXa Member

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    TDP is not max power usage - more like average gaming power usage

    EDIT: and running a PSU at 100% load is asking for a bitch slap to the wallet
     
    Last edited: May 9, 2012
  6. OP
    OP
    rickross

    rickross Member

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    Yeah thought I might be cutting it fine.

    You mean the PSU will run ineffeciently or risk blowing the whole PC up completely?

    May have to try and slip a new PSU past the mrs ;)
     
  7. HeXa

    HeXa Member

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    still likely 80% but you will be hammering the 12V 'rails' (seems to really be a single rail) very close to their max rating

    http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story2&reid=21

    any stressful graphics or compute loads will put the PSU well over its wattage and I'm not sure those have OCP
     
  8. pantsonnos

    pantsonnos Member

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    Looks like the HX620w only has 2 pcie power cables (6pin or 6+2pin depending on the age)

    Source
    Youll need 4 6pin for 2 GTX570s...
     
  9. Dilbery

    Dilbery Member

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    Hell no, I tried it on my 700w and failed miserably.
     
  10. slyls1

    slyls1 Member

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    I would recommend at least 850w. Especially if you want to oc.
     
  11. OP
    OP
    rickross

    rickross Member

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    Cool, thanks guys :)
     
  12. O-B-E-L-I-X

    O-B-E-L-I-X Member

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    Do not make up things, read the review. http://www.guru3d.com/article/geforce-gtx-570-review/8 This cards have 2x6 pin PCI-E cables and the PCI-E slot = 225Watts all up maximum power supplied at any given moment http://forums.nvidia.com/index.php?showtopic=175438 ...a device can not use more power than it can be supplied with, that should make sense ;)

    The reviewer measured 369Wattas for a system with one card at full load and additional 225W @20A for any extra cards...
     
  13. Aetherone

    Aetherone Member

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    Unlikely. I measured 840+ watts at the wall for a SLI570 26K system at full load.
     
  14. HeXa

    HeXa Member

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    :lol:

    yeah.... because Nvidia never makes their high-end cards capable of drawing more than PCI spec :rolleyes:

    regardless of your inability to understand gaming loads vs max loads, at least read the article you link

    EDIT: proper gpu consumption testbed review -> http://www.techpowerup.com/reviews/ASUS/GeForce_GTX_570/25.html
     
    Last edited: May 10, 2012
  15. O-B-E-L-I-X

    O-B-E-L-I-X Member

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    Alright, you win. I guess you can't trust all the reviews.

    Did some experiments of my own with my GTX570, although this one is on the GTX580 board and it has 1x8pin and 1x6pin power connectors...the PSU is Silver , so it looses ~ 10% at 50% load:


    ---------------Stock 732MHz-----------------O/C 830MHz
    Idle-----------100W (85W)--------------------100W (85W)
    Combuster----310W (279W)-------------------310W (279W)
    Furemark-----375W (338W)-------------------410W (369W)

    The first values are at the power point and the ones in brackets are approximations of the actual PSU delivery. These represent total for the GFX card and the SB system O/C to 4.5GHz...


     
  16. Aetherone

    Aetherone Member

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    Unless you were running something to stress the CPU as well, your totals are for mostly the videocard and some fraction (1/4? 1/6?) of the CPU.
     
  17. O-B-E-L-I-X

    O-B-E-L-I-X Member

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    Alright, just tested that scenario, although very highly unrealistic under normal use. CPU all cores and GPU at full blast:
    500W at the wall. ~450W PSU
     
  18. munchkin1

    munchkin1 Member

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    Don't listen to idiots saying no.

    I have a 5 year old HX-620, running

    i7 2600k OC'd
    GTX580 OC'd
    CPU water cooling
    Z77 sabertooth motherboard
    8gb ram
    SSD + 3 HDD's
    Bluray drive + DVD writer drive
    ~8 120mm fans plus a 250mm fan, most LED
    Heaps of random USB crap, card reader etc

    Works perfectly fine running 24/7.

    HOWEVER, as mentioned, it only has 2xPCIE power connectors, to run SLI with cards that need 2 each, you obviously won't have enough.
     
  19. HeXa

    HeXa Member

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    well done munchkin1, congrats on not reading
     
  20. munchkin1

    munchkin1 Member

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    Who bothers to read more than just the OP and first reply these days? :Pirate:
     

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