Page 1 of 2 12 LastLast
Results 1 to 10 of 14

Thread: 290x crossfire: Is a bigger PSU a waste?

  1. #1
    Join Date
    Apr 2014
    Posts
    11
    Thanks Thanks Given 
    3
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Default 290x crossfire: Is a bigger PSU a waste?

    Hello all,

    My 1st post, but I have been reading for years as I am believer that perhaps the most important piece of a computer is the PSU, as it touches everything. I preach to all who will listen that your budget dollars should be allocated to a good PSU first.

    So I appreciate all who have put in time to put out good info for the PSU's, thank you!



    So having said that, I am about to go Crossfire on 290X. PSU calculator says I need 1077w for my spec (below). I have confused myself with so much reading.

    So here are my questions.

    1. I can buy EVGA G2 1000w for $200 or the EVGA G2 1300w for $5 more... IS it a waste?

    2. I have read a few places that a quality 850w/860w would be Ok for Crossfire 290x with an OC..and the savings would be about $50, and I really wouldnt mind saving $50...but......

    3. Anything else you guys would recommend?

    SPECS
    i5-3570k OC'ed to 4.5
    5670x1980 for monitors
    16gb ddr3
    1x 10k HD
    1 SSD
    1 CD/DVD RW
    6x140mm Noctua fans
    2x120mm fans with LED (came with the corsair carbide case)
    and Noctua DH D14 heat sink with a 120mm fan and a 140mm fan

  2. #2
    Join Date
    Aug 2010
    Posts
    2,700
    Thanks Thanks Given 
    116
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Default

    1300W is a huge waste. 1000W would be still a waste, unless whole system heavily OC'd and loaded 24/7.

  3. #3
    Join Date
    Jul 2009
    Location
    Germany
    Posts
    3,522
    Thanks Thanks Given 
    6
    Thanks Thanks Received 
    33
    Thanked in
    30 Posts

    Default

    850W is more than enough, 1000W is a waste, even if some system builder does that....

    You may need 1000W if you set your 290ers under water with 1,2V Core and 1200MHz.
    If you don't, you'll be fine with 850W...

  4. #4
    Join Date
    Dec 2013
    Posts
    48
    Thanks Thanks Given 
    28
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Default

    850W is not waste, if he use 200mV +

    With 200mV + one card only can pull up to 500W +

    Go with the 1300W.

  5. #5
    Join Date
    Aug 2010
    Posts
    2,700
    Thanks Thanks Given 
    116
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Default

    With 200mV + one card only can pull up to 500W +
    Proof?

  6. #6
    Join Date
    Dec 2013
    Posts
    48
    Thanks Thanks Given 
    28
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Default

    Last edited by Tazz; 04-21-2014 at 04:06 PM. Reason: Please don't hotlink images from other sites. Simply post a link to them.

  7. #7
    Join Date
    Jun 2010
    Location
    The Netherlands
    Posts
    5,225
    Thanks Thanks Given 
    374
    Thanks Thanks Received 
    70
    Thanked in
    60 Posts

    Default

    I see 1050W, with two overclocked R9 290X cards, with a high-end system and included loss at the PSU. So that's about ~375W max for one card with OC?

  8. #8
    Join Date
    Dec 2013
    Posts
    48
    Thanks Thanks Given 
    28
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Default

    Yes i'm talking about watts pulled from the wall, and also keep in mind, BF4 is not stressful enough, if that was Crysis 3 it would be even higher consumption. So yea, 1000W is not waste if you go crazy with volts....also this does not take into account random peak consumption, which can be even higher, when the cards are stressed hard with synthetic and similar hardcore games for prolonged periods.

    "Something I didn't expect, was using the "200% scaling" in Battlefield 4, which is just a fancy word for Super Sampling. Using this 200% option renders the image at 200% of the original, rendered resolution, and considering we're running 2560x1440 - this is a huge task for the GPU.

    It is rendering an image much larger than 4K, and sampling it down to fit onto our 2560x1440 display. This gives the GPUs a much tougher workload, something I didn't see coming - not this much, anyway.

    "We went from 860W on our overclocked Tri-X GPUs to a massive, unexpected 1050W. I couldn't believe my eyes when I saw the power meter ticking at 1050W, as this is something I would've expected from a 3-way CrossFire setup"

    Taken from the review..

  9. #9
    Join Date
    Aug 2010
    Posts
    2,700
    Thanks Thanks Given 
    116
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Default

    Except actual DC load of PSU is lower due to efficiency losses.

    Ie. what you read from the wall is not DC load of the PSU, it's DC load + efficiency losses.

  10. #10
    Join Date
    Dec 2013
    Posts
    48
    Thanks Thanks Given 
    28
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Default

    Yes i'm aware....but still its very high load, i saw 1000W good quality psu's being shut down due to OCP cause of oc 290x crossfire and i7 3770K@4.8....

Similar Threads

  1. Replace my PSU, or is it a waste of money?
    By Sharp64 in forum PC Power Supply Discussion
    Replies: 5
    Last Post: 11-22-2015, 05:09 PM
  2. Does a bigger PSU mean a quieter PSU?
    By Oklahoma Wolf in forum PC Power Supply Discussion
    Replies: 71
    Last Post: 10-06-2014, 01:25 PM
  3. Does a 'future-proof' PSU exist? And is bigger always better?
    By FakeDave in forum PC Power Supply Discussion
    Replies: 20
    Last Post: 02-10-2011, 03:48 PM
  4. Bigger psu?
    By Darthane in forum PC Power Supply Discussion
    Replies: 1
    Last Post: 09-03-2007, 02:05 PM
  5. Need a BIgger Reservoir?
    By Spectre in forum General PC Hardware
    Replies: 5
    Last Post: 01-07-2007, 12:59 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •