temps are not really the issue. if temps were the issue you could just run like MSI afterburner and put ur fans at 100% manually. i have seen 35* idle temps but if i push my core clock past 935 on my GTX460 SC BAM!!!! my display driver crashes after only 2-3 seconds of me applying the OC. Its kida like a CPU oveclock. just because it works for a little bit and it boots does NOT mean its stable either
also you can run MSI afterburner ontop of your games. its an option in the setting on afterburner that it will display "GPU1 TAMP ***C" at the top left side of your screen incease you want to keep an eye on your temps.