sorry for double post, I've heard, for dual graphics I need dual channel memory (at least 2 modules), it's that true?
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Once you've installed the latest AMD Catalyst drivers and connected your monitor to the discrete Graphics Card, you can control which applications use which Graphics Card via the AMD Catalyst Control Center.
Regarding the memory it's not required to use Dual Channel Memory but it may be advantageous, performance wise, to do so. I would recommend using the faster memory possible, either 2400Mhz or 2133Mhz. Please check with the Motherboard manufacturer of the system for compatible and recommend memory amount and speed.
Check out our Dual Graphics FAQ for more details.