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I bought a laptop Lenovo G505s with dual graphic AMD Radeon 7640G + 8500M. The graphics cards configuration is totally normal on my Windows 8, but only the 7640G is visible on Ubuntu:

~$ fglrxinfo 
display: :0  screen: 0
OpenGL vendor string: Advanced Micro Devices, Inc.
OpenGL renderer string: AMD Radeon HD 7640G
OpenGL version string: 4.3.12798 Compatibility Profile Context 13.35.1005

When I start video application like GoogleTalk, Skype or VLC, the processor eat up to 250% of CPU.

~$ top -n 1

top - 02:32:21 up 8 min,  2 users,  load average: 1,91, 1,16, 0,67
Tasks: 215 total,   5 running, 210 sleeping,   0 stopped,   0 zombie
%Cpu(s):  8,7 us,  3,0 sy,  0,2 ni, 76,2 id, 11,6 wa,  0,2 hi,  0,0 si,  0,0 st
KiB Mem:   7287548 total,  2301504 used,  4986044 free,   176936 buffers
KiB Swap: 16777212 total,        0 used, 16777212 free.   757960 cached Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND     
 3990 mahefa    20   0 1273164 148320  33180 S 214,3  2,0   1:01.52 GoogleTalk+ 
 3962 mahefa    20   0 1292436 206736  33688 R  24,5  2,8   0:11.81 chrome      
 1080 root      20   0  454012 136408 116156 S  18,4  1,9   0:21.48 Xorg        
 1937 mahefa     9 -11  514708  11360   8680 S  12,2  0,2   0:05.82 pulseaudio  
 2003 mahefa    20   0 1315164 114420  64140 R  12,2  1,6   0:23.73 compiz 

and the temperature goes very high

~$ sensors
k10temp-pci-00c3
Adapter: PCI adapter
temp1:        +72.8°C  (high = +70.0°C)
                       (crit = +105.0°C, hyst = +97.5°C)

I've done a lot of research and followed many tutorial. I've already tried all the 3 drivers (fglrx, fglrx-update, xserver-xorg-video-ati) and the driver from AMD site. I've followed this Ubuntu Wiki, both via command line and manual install, but no success. Please, anybody help. Thanks a lot.

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