Model No. Specification C501 Celeron M 1.73 GHz/940 chipset/1MB L2 Cache/256DDR/80HDD/DVD+CDRW/Combo/Wi-fi/Lilon/15.4"Wide Screen w BV/Firewire/Linux C303 Cen.Solo .86Ghz/945GM/256DDR/60GB/DVD+CDRW/Combo/Lilon/15.4" WXGA/WiFi/Bluetooth/5-in-1 card reader/ C505 /945GM/512DDR/80GB/DVD+CDRW/Combo/Lilon/15.4" WXGA/WiFi/Bluetooth/5-in-1 card reader/ V3239TU Cen 1.6Ghz Duo Core/945GM/512DDR/60GB/DVD+RW/Combo/Lilon/14.1" WXGA/WiFi/Blth/card reader/ WIN VISTA V6111TU Duo Core/945GM/512DDR/80GB/DVD+RW/Combo/Lilon/15.4" WXGA/WiFi/Blth/card reader/XPH V3155 AMD Turion 64 2.0 Ghz/512DDR/80HDD/DVD+RW/WIFICombo/Lilon/14.1"XGA/WiFi/ B1914TU Cen.Core/ATIR415 chipset/1GB DDRII/100GB /DVD+RW with LS/Combo/Lilon/12.1" WXGA/WiFi/Btooth/XPH/NAV