i got I had (190.38_desktop_win764bit_whql) downloaded from (http://www.nvidia.com/object/win7_winvista_64bit_190.38_whql.html) But beacouse ALT-TABing Desktop to game was very slow i had to w8 around 10-20sec. i got suggestions to install Driver (190.56 downloaded from http://developer.nvidia.com/object/opengl_3_driver.html) that fix the alt-tabing but the freeze problems still exist.
hmm I used Xtreme tuner to increase the fan speed but same problem. RivaTunner dosent recognised the drivers :S.
hmm I dont know but is there any chance to open that card and clean it? Cooler is cleaned it dosent overheat there. Overheat is backward card under the brand writed on it here look http://www.guru3d.com/imageview.php?image=16293. Maybe its dusty >.<
You could try removing the cooler and reapplying some thermal paste on the chip - if feel comfortable doing this and don't have any warranty left on the card. Otherwise get a RMA and get a replacement.
Problem resloved http://www.voodoo.bg/categories/378/products/8319 resloved the problem. Idle 40'C games 70'C maximum.