PC update process?

I have just upgraded my HP/Compaq presario from 2GB RAM to 4GB and am thinking about upgrade HDrive SSHD foe max speed/storage. any input would be appreciated!
Richard S.
 
My computer started out with 4 GBs RAM.
I let the Crucial scanner determine what I needed.
I could only have 8 GBs RAM total so I added 4 more GBs.
Worked good.
No problems.
 
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