8GB Total. Two 4GB PC2-6400 200 pin SODIMM DDR2 800MHz for Sony. LIFETIME WARRANTY. Major brand memory. We do not sell "OEM" memory which may be incompatible, unstable or prone to early failure. 64-bit operating system is required to use over 4GB of memory. 32 bit systems such as Windows XP home edition and Vista 32 bit will not recognize more than 4GB of memory. Compatible with DDR2 versions of: Sony VAIO VGN-SR11M SR129E/B SR12G/P SR130E/B SR130E/P SR130E/S SR130N/B SR13GN/B SR140E/B SR140E/P SR140E/S SR140N/S SR150A/B SR150A/P SR150FN SR15SN SR165E/B SR165E/P SR165N/B SR190 CTO SR190EAJ SR190EAQ SR190EBJ SR190EBQ SR190ECJ SR190ECQ SR190EDJ SR190EDQ SR190EEJ SR190EEQ SR190NAB SR190NBB SR190NCB SR190NDB SR190NEB SR190NFB SR190NHB SR190NIB SR190PAB SR190PCB SR190PFB SR190PGS SR19VN SR19XN... Less