Power supply big enough?

I am wondering if Antec NEO ECO 400C 400W Continuous Power ATX12V / EPS12V 80 PLUS Certified Active PFC Power Supply http://www.newegg.com/Product/Product.aspx?Item=N82E16817371029 would be enough for a phenom II x3 720 with a 5770 and 4gigs of ram
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  1. It's a close call. Looks like your 400 watt power supply is a little weak.

    Here are the ATI recommended power supply requirements for the new ATI Radeon HD 5770 and 5750 video cards:

    450 Watt or greater power supply with one 75 watt, 6-pin, PCI Express® power connector recommended.

    600 Watt or greater power supply with two 75 watt, 6-pin, PCI Express® power connectors for ATI CrossFireX™ technology in dual mode .

    The recommendations are for an entire pc system.

    Technical review of the 5770 showing power consumption:


    Power consumption, temperature, and noise levels are very encouraging.

    Corsair, PC Power & Cooling, and Seasonic are some of the brands that have a reputation for high quality power supplies that consistently earn high marks in technical reviews. They are reliable, stable, and come with a 5 year warranty. Some of the newer models come with a 7 year warranty. Lately we've been seeing a few other brands offering some high quality units. An example would be the Antec Earthwatts series which is a major improvement over Antec’s older psu’s like the Basiq models.
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