i guess you can play successfuly crysis if you have a quad core cpu and a dx10.1 card like 9800 series from nvidia

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Current system:
Pentium 4 2.4C Northwood
Asus P4P800 SE
4x512MB Ram DDR1 Twinmos
Nvidia 6800 Ultra 256MB DDR3
Sound Blaster Audigy
Nec 3540A Dvd Writer