Compaq Presario PC, Dual-Core 2.5GHz CPU, 3GB, 320GB for $279.90 shipped. Here is a screenshot for your reference. This system features an AMD 2.5GHz CPU, 3GB RAM, 320GB hard drive, DVD burner, Windows Vista Home Premium, and more. Note that this system is also eligible for Free Windows 7 Upgrade. Most places have it for $347 or more.