Want to go crossfire, dont know if my PSU is enough

I want to get another 4870 1gb but i dont know if my 750W PSU can take it.

Specs: Intel core i 7 920 oc'd to 3.16ghz
6 gb ddr3 RAM
ATI Radeon 4870 1gb
1 terabyte 7200rpm harddrive
5 answers Last reply
More about want crossfire dont enough
  1. Hello! Welcome!
    no specs?
  2. Please give the exact PSU model.. Though generally, even a good 650W model PSU can handle a pair of 4870's and an overclocked i7 with ease..
  3. Model of PSU would help but 750watt should do it. Go to this page and calculate your draw
    http://extreme.outervision.com/psucalculatorlite.jsp
  4. Hi,
    My current spec is:
    i5 2500k @ 4.6Ghz
    Asus P8P67 Pro R3 Mobo
    8GB Corsair Vengeance RAM 7-8-7-24 1T @1600Mhz
    2 x 2GB MSI 6950 X-Fire
    Asus Xonar DS SoundCard
    2 x Intel X25-M 80GB RAID 0
    WD 640GB HD
    OCZ Stealth Xtreme 750W PSU
    Corsair H70 Cooler
    NZXT Digital Fan Controller controlling 5 120mm fans
    Win 7 64bit Premium
    Antec 1200 Case 3 120mm fans and 1 200mm fan
    DVD rw drive

    My 750w ocz psu runs everything fine although it does heat up while playing bad company 2 and the fan noise increases on the psu. So far ive had no problems.
  5. http://www.amd.com/us/products/desktop/graphics/ati-radeon-hd-4000/hd-4870/Pages/ati-radeon-hd-4870-system-requirements.aspx

    Quote:
    500 Watt or greater power supply with two 75W 6-pin PCI Express® power connectors recommended (600 Watt and four 6-pin connectors for ATI CrossFireX™ technology in dual mode)


    As you can see above, ATI says ya need a 600 watter. You may want to run OCCT's CPU and PSU tests to see if you are seeing any voltage anomalies. The ATX spec is 5%, but with twin cards and OC'ing, I look for no more than 1% voltage variation in order to maintain the voltage stability necessary for high OC's..

    http://www.ocbase.com/perestroika_en/index.php?Download

    The OCZ "Stream" series was not very good.....the GameXtreme gets a 7.5 performance rating here:

    http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story3&reid=24

    If you get worried about the excess heat and noise is bothersome, Antec makes a hi end PSU series specifically for the 1200 and 3 other performance oriented cases (P183, P192, DF-85). Jonnyguru says:

    http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story4&reid=142

    Quote:
    [The CP-850] is completely unmatched by any ATX unit on the market I can think of. You'd have to spend twice as much as this thing costs to find the next best thing, performance wise.


    For a detailed review of the Antec 1200 / CP-850 combo, read the conclusions here:

    http://www.silentpcreview.com/article971-page7.html
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