AMD HD 7750 crashes? Blacks out?

My new AMD HD 7750 will not work under load higher than 70%. I could pass Windows Assessment test and when I ran NFS MW 2012 edition, it played for a few minutes (like 5-8 under maximum settings and 1440*900 res.) and then the display became blank and the card's fan started to spin at a very high RPM. I have 2... show more My new AMD HD 7750 will not work under load higher than 70%. I could pass Windows Assessment test and when I ran NFS MW 2012 edition, it played for a few minutes (like 5-8 under maximum settings and 1440*900 res.) and then the display became blank and the card's fan started to spin at a very high RPM.
I have 2 GB of RAM. Is it because of this or that I am having a 400 Watt power supply?
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