+1 for the PSU. GTX470 unfortunately is a power hungry card.
Reply to Bejusek
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December 1, 2012 12:10:30 PM
Also another +1 for the PSU. The PSU may have enough watts, but may be lacking requirements elsewhere or may even be faulty. If you have a cheap PSU it may be understandable why this problem occurs; the efficiency of cheap PSUs are sometimes quite poor and usually cannot provide enough power constantly to all the components.