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Asus hd7770-2gd5 reboots computer constantly

February 22, 2013 1:01:16 AM

I bought an Asus HD77770 2gd5 and had a replacement sent. Both cards reboot my HP H81030 64bit Win7 10GBram 1.56TBHD machine constantly. The stock OEM Radeon 6670 card works flawlessly. Tried new power supply. Runs 10 minutes and reboots windows. Will do it over and over.
Any Ideas?