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Does My Power Supply Have Enough Wattage for Crossfire?

Hello, I wanted to Crossfire my XFX 2GB 6950 and I was wondering if I had enough wattage to power them, I have an Antec Earthwatts 650W 80 PLUS Bronze Power Supply and I know that it seems like it would not be enough but when I put all of my specs into a Power Supply Calculator it says that I only need 550W of power but the one thing that I am not sure about is when it says "capacitor aging" because when I put that to full it says I need 750W of power, so can someone tell what capacitor aging is? and if I have enough power crossfire 6950's. Here are my specs. Also my Motherboard has gold capacitors if that really makes a difference.


i5 2500k @ 3.3GHz || XFX 6950 2GB Dual Fan || Corsair 120GB Force 3 SSD || ASRock Extreme3 Gen3 Motherboard || 8GB G.SKILL SNIPER RAM 1600Mhz || 750GB 7200RPM Hitachi Hard Drive || Antec Earthwatts 650W 80 Plus Power Supply || NZXT Phantom Full Tower Case in White || Hyper 212 EVO CPU Cooler || ASUS 24X DVD-RW ||
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  1. Best answer
    Which model of XFX 6950 do you have, if you don't know the exact model then what are clocks?

    http://www.anandtech.com/show/4061/amds-radeon-hd-6970-radeon-hd-6950/24
    This review shows a system with two stock 6950s and an OC'd i7-920 drawing 470W at the wall under Crysis and 509W at the wall under Furmark. The i7-920 is much more power hungry than the i5-2500K, so you're system power consumption is likely to be much lower than those two figures even on load.
    But based on the numbers yes I think your 650W PSU is capable of powering your system with 6950 CF.

    When a PSU is high quality and has good cooling then capacitor aging is usually very insignificant, taking ~10 years to have a sizable impact on capacitance. So I'd say setting the 'capacitor aging' at more than 10% is unrealistic.
  2. 650W onwards will be plenty or 700w just for that breathing space (especially with o/ced CPUs)
  3. henydiah said:
    650W onwards will be plenty or 700w just for that breathing space (especially with o/ced CPUs)

    I probably won't be overclocking to be honest with you.
  4. Best answer selected by coper210.
  5. Silvune said:
    Which model of XFX 6950 do you have, if you don't know the exact model then what are clocks?

    http://www.anandtech.com/show/4061/amds-radeon-hd-6970-radeon-hd-6950/24
    This review shows a system with two stock 6950s and an OC'd i7-920 drawing 470W at the wall under Crysis and 509W at the wall under Furmark. The i7-920 is much more power hungry than the i5-2500K, so you're system power consumption is likely to be much lower than those two figures even on load.
    But based on the numbers yes I think your 650W PSU is capable of powering your system with 6950 CF.

    When a PSU is high quality and has good cooling then capacitor aging is usually very insignificant, taking ~10 years to have a sizable impact on capacitance. So I'd say setting the 'capacitor aging' at more than 10% is unrealistic.

    Thanks! I have this 6950 - http://www.newegg.com/Product/Product.aspx?Item=N82E16814150549&Tpk=xfx%206950%202gb

    Since it is a pretty big card do you think the two cards would be really close together and create a ton of heat? Here is my motherboard - http://www.newegg.com/Product/Product.aspx?Item=N82E16813157271
  6. Yea, that's a stock clock model XFX so the power consumption should be quite similar.

    There will be one PCI slot (about half the height of a dual slot card like the 6950) between the two cards, which is fairly standard and is certainly better than compared to no slots separating cards.
    The NZXT Phantom is quite a good tower for cooling, so hopefully it will be able to deal with CF 6950.
    I won't lie to you heat and noise will increase, but I don't have any experience of CF/SLI so I don't really know what it'll be like.
  7. I am doing with Corsair VS-450 powering 2x Xeon 5160 3GHz CPU with 2x PCI-E ATI HD 4850 in crossfire, 2x180mm fan and 4x120mm fan , a pair of CCFL, 2x 7200RMP HDD, 8x 1GB FullyBuffered RAM, Server Board (S5000PSL), 1x DVD-RW drive, 1x USB 3.0 card, 1x WiFI card and the lightings that come on SilverSTone Raven 01 chassis. No issues what so ever even under 100%CPU and GPU. Dont know why people use 1200w PSUs. Over Kill. Maybe the PSU is less loaded. But hey, I dont care. If the PSU blows after 2 years I buy another. I can buy 10x VS-450 for the price of one 1200w 80+ certified PSU.

    My two cents
    Sinu (sinu77@ yahoo.com
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