Unless you live in somewhere really cold (or have a really good air conditioner) or use water cooling, I highly doubt your GPU idles at 10 degrees Celsius (50 degrees Fahrenheit, for American perspective). You may have a sensor problem. Try removing the card, cleaning out the dust, and reseating the card into the PCI-E slot, then check the temps. A GTX 970 shouldn't ever get that hot unless you are purposefully overclocking it to the GTX 480's level of hell.