Here are the Dead Space System Requirements (Minimum)
CPU: Pentium 4 or Equivalent
CPU SPEED: 2.8 GHz
RAM: Windows XP 1 GB, Windows Vista 2 GB
OS: Windows XP, Windows Vista
VIDEO CARD: 256 MB (with pixel shader 3.0 support), NVIDIA GeForce 6800 or better (NVIDIA GeForce 7300, 7600 GS and 8500 are not supported); ATI X1600 Pro or better (ATI X1300, X1300 Pro and HD2400 are not supported).