How much watts do I need "gtx 970 g1"

xGlance

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Nov 24, 2014
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I have
gigabyte GA-Z68AP-D3
Intel i5 3550
2*4gb ram @ 1333hz
seagate 1tb hdd
dvd
gigabyte gtx 970 g1

i already have a 500w psu but im worried that it will damage the parts.

any recommendations?
 
thank you for your response.
i Think i will get a 700w one to be in the safe side,
i have another question, do you think the 970 g1 will bottleneck with the i5 3550?
do i need to upgrade something?