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trifire 5870 on a hx850?

Discussion in 'AMD / ATI' started by ucanmandaa, Aug 15, 2011.

  1. ucanmandaa New Member

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    Hi guys, as title says can it handle a trifired 5870 setup? My cpu is a PII x6 at 4.0ghz.
     
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  2. xBruce88x

    xBruce88x

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    from AMD's website,

    so since you only need an extra 100w for a 2nd card, I'd assume that another 100w would cover the third card? meaning 700watt with six 6-pin connectors.

    Your power supply has exactly six 6+2pin PCI-e plugs. It has a single massive 70A 12v rail. so if i'm correct that the pci-e slot itself can give 75w, then the most that could possibly be use through all those connections is 675w. /12 and that's 56.25A. I don't think those cards are maxing out the power connections so you should be fine.

    what was your cpu's stock speed so i can figure out the wattage its using after the overclock?
     
    ucanmandaa says thanks.
  3. ucanmandaa New Member

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    my cpu is a pii X6 1090t. Its stock speed is 3.2ghz. I have two hds + a sdd + an optical drive and 8gigs of 1600mhz ram (running at 1.65v).
    my case has a total of 5 fans and that psu is about 10 months old if that matters right now.
     
  4. xBruce88x

    xBruce88x

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    using a psu calculator, i got 626w min, 676 recommended for 2 cards. i dropped one card to get the diff so i could add up for 3. with one card i got 480w min, 530 rec. using that I can calculate about 772w min, 822w recommended. This is with your cpu overclocked and said additional hardware from your post. i picked 1.45v instead of 1.4v for your cpu just to be on the safe side, and at that setting your cpu would be using 168w.

    bottom line, 772w Minimum. 822w recommended. This is with 15% capacitor aging included. please note, the site probably used reference designed gpus. the gpu's should be fine at stock (reference) speeds. if you want to overclock, i'd go for a 900-950watt. if you can't afford another psu, you can save 43w by returning your cpu to stock until you can save for a higher psu

    edit: site used http://extreme.outervision.com/PSUEngine
     
    Last edited: Aug 15, 2011

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