only r7xx chip I have is the HD 4650, and it runs pretty cool to begin with. Using the 9.2 driver on Mepis 8 32bit installed by sgfxi -f option.
Okay, support for dynamic switching is handled by the X.org infrastructure: http://www.phoronix.com/scan.php?pag...item&px=Njc2Nw :: http://ajaxxx.livejournal.com/60080.html
You are largely at the mercy of the X-server developers as to when dynamic switching will become available.
And no. Socket AM3 motherboards are not backwards compatible with Socket AM2 processors.
You can put a socket am3 processor on a Socket AM2 motherboard providing the vendor has supplied a bios update.
You cannot put a socket am2 processor on a socket am3 motherboard ... no matter what happens.
Socket AM2 processors use a DDR2 memory controller, and all Socket AM2 motherboards use DDR2 memory.
Socket AM3 processors contain BOTH a DDR2 AND a DDR3 memory controller. Socket AM3 motherboards utilize DDR3 memory.