Mixing memory sizes

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I've recently obtained a CPU/mobo combo and it came with a single 4GB stick. Clearly this won't run in dual channel so i'm wondering if I can add a 2GB stick as I have one lying around. Would this cause system instability or effect the systems performance in a negative way?
 
You would get away with it, but you would be asking your system to do something it doesn't have to do...

I would sell the 2gb stick you got and buy an identical 4gb stick... it would work better than the option you have, also trying to overclock a 4gb stick and different 2gb stick would be a bitch!
 
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