Does a 4GB 800MHZ DDR3 ram co-exist with another 4GB 1333MHZ DDR3 ram in a laptop ?

mferioe

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Jun 20, 2015
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My laptop is having a 4GB 800MHZ DDR3 ram as single piece. I would like to add one more blade to increase the capacity. I have bought another 4GB 1333MHZ DDR3 ram to add up. Do the two pieces co exist ? If not, I want to return it before opening.