How do I know if my DV3 notebook uses discrete or UMA memory? (I need a new Fan Assembly)

I haven't got the PC with me right now, but from memory it's a DV3 2120 EA
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Hi, I think you may mean graphics and not memory.
Here are the specs for the unit you listed
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01806759&tmp_task=prodinfoCategory&cc=uk&dlc=en...
Here is the guide for your notebook, it has the parts,
http://h10032.www1.hp.com/ctg/Manual/c01720761.pdf
There are online parts stores in some regions, or you can go to an Authorized HP repair provider
I am an HP employee
Knowledge is power...Power to the people

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