I have the Acer E1-451g laptop which has two GPUs. One from its A8-4500M processor(a Radeon 7640G) and a Radeon 8750M. Either cards aren't really that great but it has a great range of playing AAA games no sweat around medium settings (http://www.youtube.com/user/MrZeropopulation This guy has vids showing him playing BF4, Bioshock Infinite on Ultra, etc). I can't seem to get on his level of performance. Dota2 is my most played game and I'm experiencing framerate going below 20.
I've tried downloading from AMD's(14.4) and Acer's(13.15? Installs drivers but cannot open CCC) site, but no dice. I ran HWMonitor to see what GPU is heating up and it's only ever the 7640G. Is there something else I could try?