GTX470 occasionally black screen and hard freeze
I got an EVGA GTX470 for a couple of weeks now and sometimes my desktop just turns into a black screen and hard freezes my pc. This never happens when the card is under heavy load e.g. gaming, cuda, benchmarks. It seems to happen when the card is switching to a lower power profile when its set to adaptive power mode. This issue is operating system independent as far i can say. I had it on Arch Linux with the 256.35 Linux driver as well as latest Windows driver on Windows 7 x64. I never had this problem with my old GTX275. Is this a sign of a faulty card or a driver bug with power modes ? The card works perfect and reliable at maximum performance when playing games. The last crash occured after running Furmark, when the card cooled down and (probably) entered a lower power mode. Temperatures are alright, 39°C idle, 75-80° when playing and 90° Furmark. I recently installed a X-Fi Titanium Soundcard and they share the same IRQ but i doubt that will lead to problems like this.
Any suggestions ?
Thanks in advance