Product Detail Box Contents - HP Pavilion a6742p Desktop PC, HP optical mouse, HP multimedia keyboard Intel Pentium E5300 2.6 GHz Processor 2 MB L2 Cache, 800 MHz Bus Speed 6072 MB DDR2 (PC2-6400) RAM Max - 8GB 500 GB (7200RPM) SATA Hard Drive . The "HP Pavilion a6742p Desktop,2.6GHz Pentium E5300,6GB,500GB,DVD+/-R/RW, Integrated 10/100/1000 Base-T networking interface, Memory card reader, Keyboard and mouse ,Windows Vista Home Premium, Factory Refurbished" is best product for you. We recommended HP Pavilion a6742p Desktop,2.6GHz Pentium E5300,6GB,500GB,DVD+/-R/RW, Integrated 10/100/1000 Base-T networking interface, Memory card reader, Keyboard and mouse ,Windows Vista Home Premium, Factory Refurbished