Models that these upgrades will work for:

HP-Compaq Presario F501AU notebook (RU940PA), HP-Compaq Presario F502AU notebook (RU941PA), HP-Compaq Presario F502EA notebook (RY574EA), HP-Compaq Presario F502EU notebook (RY583EA), HP-Compaq Presario F502LA notebook (GB122LA), HP-Compaq Presario F503AU notebook (RU942PA), HP-Compaq Presario F504AU notebook (RZ836PA), HP-Compaq Presario F504EA notebook (GF799EA or GH826EA), HP-Compaq Presario F504EM notebook (GF795EA), HP-Compaq Presario F504EU notebook (GF796EA), HP-Compaq Presario F505AU notebook (RZ837PA), HP-Compaq Presario F505EA notebook (GF794EA or GF798EA), HP-Compaq Presario F505LA notebook (GB123LA), HP-Compaq Presario F506EA notebook (GF797EA), HP-Compaq Presario F506LA notebook (GB124LA), HP-Compaq Presario F545EA notebook (RY575EA or RY579EA), HP-Compaq Presario F545EU notebook (RY582EA), HP-Compaq Presario F550EA notebook (GF805EA), HP-Compaq Presario F550EO notebook (GH832EA), HP-Compaq Presario F550ET notebook (GH827EA), HP-Compaq Presario F551AU notebook (GC188PA), HP-Compaq Presario F552AU notebook (GC189PA), HP-Compaq Presario F552LA notebook (GG539LA), HP-Compaq Presario F553AU notebook (GC190PA), HP-Compaq Presario F553CL notebook (RZ329UA), HP-Compaq Presario F553US notebook (RZ327UA), HP-Compaq Presario F554AU notebook (GG198PA), HP-Compaq Presario F555AU notebook (GG199PA), HP-Compaq Presario F555US notebook (RZ326UA), HP-Compaq Presario F557US notebook (RZ330UA), HP-Compaq Presario F557WM notebook (RZ335UA), HP-Compaq Presario F558US notebook (RZ340UA), HP-Compaq Presario F560EA notebook (GT525EA), HP-Compaq Presario F560EM notebook (GH835EA), HP-Compaq Presario F560ET notebook (GH828EA), HP-Compaq Presario F560US notebook (GF593UA), HP-Compaq Presario F562LA notebook (GM635LA), HP-Compaq Presario F564LA notebook (GN282LA), HP-Compaq Presario F565CA notebook (GL935UA), HP-Compaq Presario F565LA notebook (GM636LA), HP-Compaq Presario F566LA notebook (GM639LA), HP-Compaq Presario F571AU notebook (GJ181PA), HP-Compaq Presario F572AU notebook (GJ182PA), HP-Compaq Presario F572US notebook (GF596UA), HP-Compaq Presario F573AU notebook (GM243PA), HP-Compaq Presario F577AU notebook (GS085PA), HP-Compaq Presario F577CL notebook (GF602UA), HP-Compaq Presario F579WM notebook (GF606UA)