Product Detail 4GB 500GB DVDRW WVB . The "Lenovo ThinkStation D20 4155 - Tower - 2 x Xeon E5520 / 2.26 GHz - RAM 4 GB - HDD 1 x 500 GB - DVD-Writer - Quadro FX 580 - Gigabit Ethernet - Vista Business 64-bit - Monitor : none - TopSeller" is best product for you. We recommended Lenovo ThinkStation D20 4155 - Tower - 2 x Xeon E5520 / 2.26 GHz - RAM 4 GB - HDD 1 x 500 GB - DVD-Writer - Quadro FX 580 - Gigabit Ethernet - Vista Business 64-bit - Monitor : none - TopSeller