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
  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

    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..


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


    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:


    [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:

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