Before you upgrade to a faster and more powerful graphics card, you should make sure your computer's power supply can handle it.
What brand name and model number and wattage is the power supply?
How many amps does it have on the 12 volt rail?
Submitting an image of its label would provide all the information that we need.
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There doesn't appear to be a NVIDIA GeForce 970, so I assume you're referring to a NVIDIA GeForce GTX 970.
Its "minimum" requirement appears to be 500 watts.
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What brand name and model number and wattage is the power supply?
How many amps does it have on the 12 volt rail?
Submitting an image of its label would provide all the information that we need.
----------------------------------------------------------
There doesn't appear to be a NVIDIA GeForce 970, so I assume you're referring to a NVIDIA GeForce GTX 970.
Its "minimum" requirement appears to be 500 watts.
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