Yes use the leshcat drivers. With the 15.7 v1.2 the gpu is always on ulps set to 0 in regedit keeps the gpu always on. The only advantage I see to this is that windows starts up faster and also wakes up properly. If you set it to 1 its turns the gpu off but start up time is really slow and same goes for wake from sleep. What I've done instead of using the 15.7 v1.2 I'm using Catalyst 14.4 WHQL UnifL v2.4 when installing make sure you install the dynamic version of the driver with this driver everything works fine the gpu stays off avg temps of 45c and start up time is much faster, but also remember to turn of automatic windows driver updating.