I lowered the voltage to 0,75 V, and the computer after 5 minutes during playback of the new Spiderman trailer hung with looped sounds of... :/

Yes. It's Gigabyte GTX460 OC1, 2 fans. Hrm, interesting. I guess there is a bit of variation in the bioses between different brands of the 460. Okay, I have an idea for you to try. Open up your bios in UE and do a HEX search for this string "47 04 01 21 00 06 26 C4 09 20 00 00 22". Without quotes, ...