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Giigabyte 660 ti (gv-n66twf2-2gd) reboot when playing

Giigabyte 660 ti (gv-n66twf2-2gd) reboot when playing
« on: March 10, 2013, 01:17:55 pm »
Hello.
I bought a new 660 TI graphics card and when I play certain games, after a few minutes, the computer restarts.

I tried the following:
  • Change the power supply for a more powerful, 700W.
  • Update card drivers.
  • Up the voltage.
  • Lowering GPU clock.

I still have the same problem, even in very demanding games.

All was right with my old graphics card.
Please, What I can do?

My system:
  • Gigabyte GA-Z68MA-D2H-B3
  • i5-2500K
  • 2 x Kingston 4 GB DDR3-1333 DDR3 SDRAM
  • Windows 7

I attached a record of GURU II before shutdown. Thanks.