850W PSU for R9 290X Crossfire?

Discussion in 'Videocards - AMD Radeon' started by K1llrzzZ, Oct 28, 2013.

  1. K1llrzzZ

    K1llrzzZ Member

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    Graphics Card::
    Sapphire R9 290X CF
    Hi guys,i have a Corsair HX850 PSU,and i want to get 2 R9 290X cards in CF,but if i do i will not have money for any other upgrade,so my question is will it work?I have an Asrock Z77 Extreme 4 mobo,i7 3770K CPU clocked at 4.5 Ghz,8 Gb DDR 3 ram,1 TB HDD+64 Gb SSD for Windows,and a Coolermaster HAF 932 case.I WILL NOT planning to overclock these cards!I will use them both in uber mode,i maybe let the fans go up to 100% if it's too hot,but i will not overclock the cards at all.
     
  2. yasamoka

    yasamoka Ancient Guru

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    290X CF H2O
    Will be fine but you won't have too much headroom.
     
  3. K1llrzzZ

    K1llrzzZ Member

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    Sapphire R9 290X CF
    An can that cause any harm to the PSU or the cards?(or anything else) If not than I'm okay with that,since im not planning to overclock as I said,or install any new hardware for a time.
     
  4. yasamoka

    yasamoka Ancient Guru

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    Nah, but I wouldn't push too much voltage in that 3770K. Power consumption can spin out of control on these chips. What voltage are you running for 4.5GHz?

    I don't think you will be able to bear 100% fan on these so consider thermals. Might be best to wait for custom coolers or install two yourself (watch out for height restrictions and airflow)?
     

  5. K1llrzzZ

    K1llrzzZ Member

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    Sapphire R9 290X CF
    1.248 V.Running the cooler at 100% on the cards will increase the tdp significantly?
     
  6. yasamoka

    yasamoka Ancient Guru

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    No, i mean the noise. Running the cooler at 100% will keep the clocks up and the temps down; this can slightly decrease power consumption.
     
  7. K1llrzzZ

    K1llrzzZ Member

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    Yeah,im okay with the noise so i will do that.Thanks for the answer(s),you were very helpful :)
     
  8. 3dPlayer

    3dPlayer Banned

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    Last edited: Oct 28, 2013
  9. yasamoka

    yasamoka Ancient Guru

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    CPU will be more than 100W if that voltage is high (don't know about Ivy Bridge voltages). Otherwise yeah your calculations are pretty accurate.

    True, HX850 can do 1000W. I have the same PSU.
     
  10. 3dPlayer

    3dPlayer Banned

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    I read that the hx750W(mine) will go up to 900W.
    source: same as the above
     
    Last edited: Oct 28, 2013

  11. Loophole35

    Loophole35 Ancient Guru

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    I never knew that. Glad I've got one in the main rig that puts my mind at ease.
     
  12. yasamoka

    yasamoka Ancient Guru

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    You're on water, too, that brings power consumption down. Plus, 670s.

    You're welcome OP.
     
  13. 3dPlayer

    3dPlayer Banned

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    Water brings temperatures down, what do you mean by power consumption down?They use more fans, fan controller panel, and a pump or 2.
     
    Last edited: Oct 28, 2013
  14. Loophole35

    Loophole35 Ancient Guru

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    Yeah I have 12 fans and one D5 pump, both my 670's run at 1.212V and my CPU is at 1.4V when it ramps up so I was a bit worried that I was pushing it on only 850W.
     
  15. yasamoka

    yasamoka Ancient Guru

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    Can bring GPU power consumption down 30W or more in many cases. Bitcoin miners watercool for that.

    Less heat = less transistor leakage = less current drawn - less power drawn.

    IBM watercooled one supercomputer of theirs to bring down power consumption 10%.

    The pumps and fans use a fraction of the power they save, especially when running fans at less than 100% and a pump on low with low-restriction waterblocks and radiators.
     

  16. 3dPlayer

    3dPlayer Banned

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    I see, thanks for the reply.
     
  17. K1llrzzZ

    K1llrzzZ Member

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    Well i have the cards,I tested heaven bench,crysis 3,3D mark 11,hitman absolution,everything was fine until i started a metro last light test...screen froze,i restarted,and BSOD...Could be a driver error,or the PSU is not enough?Or something else?This PSU is 3 years old i bought it around the summer of 2010.
     
  18. k3vst3r

    k3vst3r Ancient Guru

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    probably just driver issue
     
  19. K1llrzzZ

    K1llrzzZ Member

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    I hope so :/ after the bsod windows offered me a repair option and warned me that recently installed programs could be removed,it removed catalyst,i reinstalled and i did not see my second card in cf...i restarted again,now it sees it again.Some info on the BSOD:"The system has rebooted without first shutting down properly. This error could occur is because the system does not respond, or collapse unexpectedly terminated the power supply" Not sure if this is accurate,im from hungary,so the messsage was in hungarian,i just used google translator"
    - EventData

    BugcheckCode 0
    BugcheckParameter1 0x0
    BugcheckParameter2 0x0
    BugcheckParameter3 0x0
    BugcheckParameter4 0x0
    SleepInProgress false
    PowerButtonTimestamp 0
     
    Last edited: Oct 29, 2013
  20. Deathchild

    Deathchild Ancient Guru

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    Yeah, try some clean reinstall of the drivers. See if that solves it.
     

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