Getting a new graphics card

Hi I want to get a new graphics card currently have a NVIDIA GeForce GT 520 and wanted to upgrade to a Radeon HD 7850 but my friend told me my computer would explode if I got the new graphics card without upgrading my power supply since I only have a 500 watt one so I was wondering if I got a 630 watt power supply would I be able to use the Radeon 7850 my computer specs are

CPU: AMD Phenom 2 X4 965

Ram: 16 GB of DDR3

Motherboard: Gigabyte GA-78LMT-USB3

Power supply 500 Watt

Hard Drive: 500 GB

So ya I'm pretty new its the first computer that I made would really appreciate the advice so I don't end up getting the power supply and it doesn't work
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  1. A 500W powersupply is more then enough for a single 7850 the real question is what brand of power supply is it becuase if its a crappy low end brand power supply then upgrading it would be in your best interest
  2. I have a Silverstone power supply http://www.newegg.com/Product/Product.aspx?Item=N82E16817256061 and if I got the 630 watt one it would be a Rosewill one http://www.newegg.com/Product/Product.aspx?Item=N82E16817182200 not sure if either are any good
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