Power Supply for Xfire 6870s or Xfire 5770s | Need Advice |

I need a reliable power supply, because I have a 500w, and obviously that is probably not enough for one 6870.

How much would I need to crossfire two 6870's safely?

1000w? 750w?

On a seperate note, could two XFX 5770's run Final Fantasy XIV (Or a current game, like when Crysis was new) on high/max settings? And what power supply would those need?

One of my cards did about 2500-2800 (Score on FF XIV bench marker) With 1500 or below being insufficient to run the game.

Basically asking because I currently have a 5770, and am looking to upgrade so I can run Final Fantasy on max settings. And two 5770's vs two 6870's is a $350 price difference.

Inside of the spoiler is the scores for the benchmarking tool. (Free, just google final fantasy xiv benchmarking tool)

[8000 and over] Extremely High Performance
Easily capable of running the game on the highest settings.
[5500–7999] Very High Performance
Easily capable of running the game. Should perform exceptionally well, even at higher resolutions.
[4500-5499] High Performance
Easily capable of running the game. Should perform well, even at higher resolutions.
[3000-4499] Fairly High Performance
Capable of running the game on default settings. Consider switching to a higher resolution depending on performance.
[2500-2999] Standard Performance
Capable of running the game on default settings.
[2000-2499] Slightly Low Performance
Capable of running the game, but may experience some slowdown. Adjust settings to improve performance.
[1500-1999] Low Performance
Capable of running the game, but will experience considerable slowdown. Adjusting settings is unlikely to improve performance.
[Under 1500] Insufficient Performance
Does not meet specifications for running the game.
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More about power supply xfire 6870s xfire 5770s advice
  1. Bump: Still wondering...I tried googling the power demands from the crossfire, but I couldn't find a solution
  2. High end CPU = 125W load
    Average system with 2HDs and 1 optical and a few fans = 75W

    Single 5770 load = 110W
    Double 5770 load = 220W
    Single 6850 load = 130W
    Double 6850 load = 260W
    Single 6870 load = 150W
    Double 6870 load = 300W

    So with a dual 6870 and average system with a Core i7 930 or a phenom x6 1090t you will probably barely break 500W at load.

    You want some headroom, so lest say you go for 80% PSU load, you will want at least a 630W, preferably a 650W PSU.

    You can calculate the rest.
  3. Thanks a lot vilen!
  4. 1+vilenjan. iv used Crossfire 5770 with an OC'ed Phenom II 955 and 3 Hard drives. all on an Antec earthwatts 650w PSU
  5. I am running a Athlon II 630 OCed to 3.3 with 4gb ram and a 5770 on a corsair 550W and even under load my PSU never gets warm.

    I am pulling less than 300W at load.

    Make sure you have a qaulity PSU.

    Corsair, Antec, Seasonic, Silverstone are all top rated PSUs.

    XFX, Cooler Master are also good.

    go for 80% efficiency minimum (bronze or higher are better but you will pay for that).
  6. I need a reliable power supply, because I have a 500w, and obviously that is probably not enough for one 6870.

    How much would I need to crossfire two 6870's safely?

    1000w? 750w?

    On a seperate note, could two XFX 5770's run Final Fantasy XIV (Or a current game, like when Crysis was new) on high/max settings? And what power supply would those need?

    One of my cards did about 2500-2800 (Score on FF XIV bench marker) With 1500 or below being insufficient to run the game.

    Basically asking because I currently have a 5770, and am looking to upgrade so I can run Final Fantasy on max settings. And two 5770's vs two 6870's is a $350 price difference.


    ...
    hey you can find other place on google just look up "PC power calculator" in the serach

    http://www.antec.outervision.com/


    to me you need about 700/ 750 for good cooling and safe stable operation if you have more 3 to 6 hard drive and usb hooks ups like me.

    they are cheap now days

    http://www.newegg.com/Product/Product.aspx?Item=N82E16817182173

    look at total watts in pictures is what I do


    http://www.newegg.com/Product/ImageGallery.aspx?CurImage=17-182-173-Z07&SpinSet=17-182-173-RS&ISList=17-182-173-Z01%2c17-182-173-Z02%2c17-182-173-Z03%2c17-182-173-Z04%2c17-182-173-Z05%2c17-182-173-Z06%2c17-182-173-Z07&S7ImageFlag=1&Item=N82E16817182173&Depa=0&WaterMark=1&Description=Rosewill%20RV2-700%20700W%20ATX12V%20v2.3%20%2f%20EPS12V%20SLI%20Ready%20%20%20Power%20Supply
  7. I would suggest a 650W of a good brand (corsair for example) and it will run 2x 6870 with ease.

    Im running 5850CF (which takes more power than 6870) on a corsair TX650 and its working fine :)
  8. Setrax said:
    Bump: Still wondering...I tried googling the power demands from the crossfire, but I couldn't find a solution

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