*crysis-online.com/Information/System Requirements/
MY ESTIMATES
Minimum (800x600 with Minimum Details)
Intel P4 2.4-2.8GHz OR AMD Athlon XP 2400-3000
512MB-768MB RAM(1GB For Vista)
128MB SM 2.0 Graphic card, Geforce 6200/6600 or Equivalent(excluding LE & TC)
Recommended (1024x768 or 1280x1024 with High details)
AMD 64 3800/3700 OR Intel 3.8-4.0GHz or up(Dual Core strongly recommended)
1.5-2GB RAM(2GB of RAM for Vista)
256MB-512MB Radeon x1900/x1800xt OR Geforce 7800GTX/7900GT and up
Optimum (1280x1024 or 1600x1200 with(or without AA) MAX or near MAX settings)
Dual Core X2 (@2.4GHz or up) OR Core 2 Duo (Quad Core preferred but not required)
2GB(+) RAM
512MB(+) Dx 10 Geforce 8800GTS/GTX OR Radeon R600
MY ESTIMATES
Minimum (800x600 with Minimum Details)
Intel P4 2.4-2.8GHz OR AMD Athlon XP 2400-3000
512MB-768MB RAM(1GB For Vista)
128MB SM 2.0 Graphic card, Geforce 6200/6600 or Equivalent(excluding LE & TC)
Recommended (1024x768 or 1280x1024 with High details)
AMD 64 3800/3700 OR Intel 3.8-4.0GHz or up(Dual Core strongly recommended)
1.5-2GB RAM(2GB of RAM for Vista)
256MB-512MB Radeon x1900/x1800xt OR Geforce 7800GTX/7900GT and up
Optimum (1280x1024 or 1600x1200 with(or without AA) MAX or near MAX settings)
Dual Core X2 (@2.4GHz or up) OR Core 2 Duo (Quad Core preferred but not required)
2GB(+) RAM
512MB(+) Dx 10 Geforce 8800GTS/GTX OR Radeon R600