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The M means mobility = it takes MEMORY from the entire PC (the ram sticks)... so in this case, there is 256MB >ONLY< dedicated to the graficcard (which isnt alot), and if your game needs more memory, it will take from the RAM... = slower pc = slower gaming

so generally avoid M cards for gaming..

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13y ago

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Q: What does amd radeon hd 6490m with 256mb gddr5 mean?
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