which PSU for a 5.5ghz SB+2x6990 oced to 930/1500?

Discussion in 'Die-hard Overclocking & Case Modifications' started by Khalam, Apr 25, 2011.

  1. Khalam

    Khalam Master Guru

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    Hey Guys, im currently running an oced 2500k sb which runs at 5517mhz thats coupled with Asus 6990 thats Oced to 930/1500. im running 2x320gb F1 + 1tb baracuda + 120gb Ocz Vertex 2 + dvd drive. There is 3x230mm fans + 2x140mm fans two of which have red leds, im using Noctua Nh14d as the cpu cooler with 8gb Gskill RipjawsX 2133mhz. Its all powered by a HX1000W that I think is not up to the challenge to handle my OC:-( i can oc the 6990 to 1000/1500 but only if the Cpu OC doesnt go over 5ghz. Above that i need to lower the gpu clocks to 930/1500. i Want to go 2x6990 and iimbwondering when oced how much power will i require with my setup? will a corsair ax1200w do the job and be up to the challenge?
     
  2. ---TK---

    ---TK--- Ancient Guru

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    that corsair will run everything in your rig with room to spare. think I payed $280 for it, its not cheap
     
  3. raif

    raif Master Guru

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    well according to the guru3d review, 2 6990's in crossfire + an i7 965 pulls about 900w at full load, so im guessing an overclocked 6990 pulls a bit more, which would compensate for the fact that the 2500k pulls less than the i7.

    my guess is that an ax1200 should suffice, you might be running at 1000-1050w though. my recommendation is to monitor your system wattage while in idle, run a GPU intensive program to stress the gpu 100%, mark the peak wattage and find the difference. that would roughly be how much your 6990 pulls. then add that number to your peak number, and see how much it is.

    again, i would think that your system wouldn't pull more than 1050 watts with a 2nd 6990
     
  4. Khalam

    Khalam Master Guru

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    Great glad to hear that;-) im getting Corsair 800d on friday with there ax1200w in it and hopefully a second 6990 so ill let you know. is there any good software to monitor voltages and watage usage?
     

  5. Dublin_Gunner

    Dublin_Gunner Ancient Guru

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    You want a wattage meter between the PSU and the wall socket, and a multimeter for voltages.

    No software will be up to the task.
     
  6. Khalam

    Khalam Master Guru

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    you have any of that gear Gunner?
     
  7. Sever

    Sever Ancient Guru

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    normally yeah, sandy bridge should pull less. but at 5.5ghz, i would say the power consumption would be quite similar.

    given his overclocks, i would recommend somewhere between 1200w at 1500w, just to leave a bit more breathing room for his quadfire. when crossfired 6990s are overclocked, i would assume the power consumption could go up to 450w per card. so thats around 900w for gpus (when overclocked) + 150-200w for CPU (when overclocked) plus 100w or so for other components, in the end, he's looking at a lot of power.
     
  8. Khalam

    Khalam Master Guru

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    Thats where my dilemma comes from do i go for a corsair 1200w or whats my akternative?
     
  9. Sever

    Sever Ancient Guru

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    the silverstone strider gold im using is pretty decent. 100A on a single 12V rail.

    silverstone and thermaltake also have multirail PSU's capable of handling 1500w.

    alternatively, why not buy a thermaltake toughpower xt 775W or something that has a single 12V rail that has a lot of amps, and run that alongside your current PSU?
     
  10. avivoni

    avivoni Ancient Guru

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    man we gotten to a point where 1000 wont sufice, this is not good not good at all
     

  11. Dublin_Gunner

    Dublin_Gunner Ancient Guru

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    Don't have a watt meter, but have digital multi meters alright.

    You can get a multi meter that would do the job for very cheap, €10 - €15.
     
  12. Makalu

    Makalu Ancient Guru

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    Antec HCP-1200 is more like a 1500W unit that's been under-rated for the US 110VAC power grid. Shame you're in the UK...I have an HCP-1200 review sample for sale 200 bucks shipped to the lower 48 if anyone's interested...got medical bills to pay :-/
     
  13. TruMutton_200Hz

    TruMutton_200Hz Ancient Guru

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    You always have to factor in the aging of your PSU as well. The more power you draw from it and the more frequently you use it, the faster it ages so I would add another 30 percent to be safe and maybe even a little bit more for future upgrades.

    EDIT: I forgot to also mention that, as a PSU gets older, the maximum amount of power it can deliver gradually decreases.
     
    Last edited: Apr 26, 2011
  14. raif

    raif Master Guru

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    of course he's looking at a lot of power, question is how much. put it this way, i wouldn't settle for anything less than 1200w. still, can't believe we've gotten to a point that that isn't enough.

    how about crossfiring the 6990 with a 6970? that will lessen your power needs, and im not sure, but i dont think you'll lose out on too much power either. most likely you are going to hit a cpu bottleneck with 2 6990's as well as drivers for quad fire not being up to snuff, your probably better off with tri-fire.
     
  15. Khalam

    Khalam Master Guru

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    do you think 5.5ghz on the cpu is gone be a bottleneck? ill think about the tri-fire option, anybody else running that kind of setup?
     

  16. Sever

    Sever Ancient Guru

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    well it depends. if youre running a single monitor at 1920x1080, then you've probably already hit the bottleneck with your overclocked 6990.

    if youre running eyefinity, then you shouldnt be bottlenecked much, if at all.
     
  17. raif

    raif Master Guru

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    this is true, though i think i would still opt for the tri-fire due to quad-fire drivers not being all that great. scaling on quad-fire is terrible in comparison to tri-fire
     
  18. Dublin_Gunner

    Dublin_Gunner Ancient Guru

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    Bottleneck for what? Benchmarks, or gaming?

    I think you'll hit a wall alright benchmarking, apart from maybe heaven which doesn't really care about your CPU.

    Gaming wise, you'll certainly hit a wall, so alleviate this by whacking up the best IQ settings (tonnes of AA).

    You won't get another CPU to feed the cards much faster really, so if you hit a bottleneck with it, I'm afraid there's not much you can do unless you want to try sub-0 and get the chip to 6 or 7Ghz, but you're in a different league then, and I wouldn't want your little fella in the same room as a pot of LN2 or dry ice!
     
  19. k3vst3r

    k3vst3r Ancient Guru

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    Your HX1000 is quite capable delivering more than 1000 watts btw

    http://www.hardwaresecrets.com/article/484/1

     
  20. avivoni

    avivoni Ancient Guru

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    1,500w? those statements might have been done too early. it might be 1,200w maybe thats what ive read before anyways. makes me wonder if the corsair 1,200w psu is anybetter than the hx1000w
     

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