After installing a new GPU and PSU my computer freezes often!

I just installed my new GeForce 650 ti BOOST 2GB GPU, and a new Corsair HX750 PSU. Now my computer keeps freezing whenere every i try to play games on it. It did not do this before it only started happening after i installed the 2 parts above. Please Help !
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  1. Other Details please like motherboard , cpu, etc would be helpful.
  2. Manufacturer: ZT Systems
    Processor: Intel Core i7-3770 CPU @ 3.40GHz 3.90GHz
    This is my mother board: http://www.gigabyte.us/products/product-page.aspx?pid=4150#ov
    16GB Ram
    1 SSD
    2tb Hard Drive
  3. What is ram spec?
    Could be gpu defect.
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