bystander :
Many of these Fermi cards idle much higher than that. It all depends on the cooling and fan profile.
Some idle as high as 70C with good air flow.
If the manufacturer set it up to use low energy, it just won't turn the fan up high unless the temps are high.
If you want lower temps, you can make an MSI afterburner profile and reduce the idle temps by increasing the fan speeds.
Without arguing too much, there is no Fermi card, or any card that idles at 70c.
After looking it up, here is what they found at guru3d:
"This card ran 42 degrees C in IDLE which is very normal. When the GPU is stressed out 100% for several minutes the card reaches roughly 85 to 87 degrees C. For a GeForce GTX 580 these are rather normal numbers. Also, we measure at a room temperature of 21 degrees Celsius."
The problem with using the fan profile in Afterburner is that, while you may lower temperatures, a faster fan will mean more noise. That's a logical tradeoff, however, there is another issue: When you exit a game, the Auto fan will immediately return to its idle speed. With a fan profile, the fan will very slowly and gradually lower its speed back down to idle. This may take quite a long time. What this means is that with a fan profile, you will hear a louder fan spinning long after you have quit a game, while with Auto fan, the fan speed goes down and noise returns to idle immediately.