Power supply enough for dual 5850?

[grue]

I currently have a OCZ ModXStream Pro 700W power supply.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817341018
Based on one review (http://enthusiast.hardocp.com/article/2008/11/12/ocz_700w_modxstream_pro_power_supply), it seems that the PSU isn't the best. So here's the question: will this PSU power the following computer?

AMD phenom x4 910 @ 2.6 GHZ
2 Sapphire 5850 xtreme (currently have 1, but would like to add one more)
2 2Gb RAM
2 hard drives

The calculator here says it will use less than 500 W, but I'm skeptical about the accuracy of the calculator, and the quality of my power supply.
http://extreme.outervision.com/psucalculatorlite.jsp

[1714935047]

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[REF]

thats enough

[Genrobo]

I'd bet money on you being 100% fine at stock speeds.
If you overclock too far though, you might get a hard lockup.
Overclocking can increase power draws significantly.

[GreenSky]

A fully packed i7 Extreme Edition PC with 5850 crossfire shouldn't pull more than 500W at the AC outlet at full load.

The HardOCP review of your PSU shows that it's 81% efficient at 630W at the AC outlet.

You've got plenty of current on the 12V rails.
It should work fine.

[bitlackey]

You should be fine, if you have any issues(ie, psu shuts down)try re-balancing the load more evenly across the 2x12v rails.

[grue]

Ok, I guess i was being too cautious, probably because i read somewhere that this wasn't good for crossfiring. thanks for all your input guys.

[Horkabork]

That's a fine-ass power supply. I'm powering my dual-5850 rig with four squirrels running on little wheels, so you should be fine until you run out of nuts.

[Maxxx]

I have two rigs with dual 5850's, overclocked and humming along with 750Watt each for about a month. You will be fine.