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RE: upgrade memory on Inspiron 7720

It won't make any difference in speed - the faster RAM will simply downclock to its current speed.  The speed is limited by the mainboard and processor -- not the memory itself.

Even DDR3-1600 isn't very future-proof -- by the end of the year, a new Intel mobile platform (Skylake) will be out and it'll require DDR4 memory, so the heyday of DDR3 will soon pass.

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