hello i have hp notebook cd0077tu and i want to upgrade my laptop's RAM my laptop has 4gb in slot 1 and i want to add 4 gb ram in slot 2 and searched in crucial.com for the ram that is compatible with my notebook and it showed several ram and i am confused which one to buy because it showed three different model of 4 gb ram such as ::
1) CT4G4SFS8266 2) CT4G4SFS824A
whats the different between these and which one i have to buy to make my laptop work finely with 8 gb ram(4gb in slot 1 default+ 4 gb in slot 2< i am gonna add> )
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