bodybrdng wrote: Also remember that if you want to add another 5,25 drive it has to be SATA. There is no IDE support on the 420. The 720 also has a MUCH better power supply and motherboard. You also have two PCIe X16, 1 PCIe x1, 1 PCIe X8, can support 8GB ram, 3 PCI slots, and a 750 power supply. The 420 has 4GB max, 1 PCIe X16, 1 PCIe x1, 1 PCIe X8, 3 PCI, and a 375 power supply.
Your computer supports a maximum of 8 GB of memory when you use four 2-GB DIMMs.