Will my power supply be able to handle this?

FeaturedDa_man

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I am planning on upgrading my PC soon with the addition of an R9 280x. Currently my specs are:
AMD FX 8120 @4.0Ghz
Asus M5A97
G.Skill ARES RAM (8gb, 2133 mhz)
1 WD Blue 1tb HDD (7200 RPM)
1 Seagate HDD, 1Tb (5400 rpm)
1 Seagate HDD, 250 Gb (5400 rpm)
ASUS DVD drive
Gigabyte GTX 650 Ti 2Gb
Kingwin ABT 850MM PSU (850w)

Now my question is, will this rig, minus the 650, refrain from blowing up while running this (http://) GPU?
Thanks in advance, I really need some help with this.
 

FeaturedDa_man

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Here's a link to the PSU if you would be kind enough to look. http://
 

FeaturedDa_man

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It's been with me for a year and a half so I wouldn't be too shocked if it did, thanks though!
 

FeaturedDa_man

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Was built in November of 2012 with intentions of upgrades that I just now can start.