My computer is dying, its motherboard sending out distress signal beeps as it's old Penitum 4 core slowly dies, am hoping to upgrade it. Only updating the components below, I have a 430 W rated PSU and a Soundblaster X-fi ExtremeMusic. So far this is the config am looking at:

• Intel Core 2 Quad 2.40 Ghz 8Mb Cache
• Asus P5KR
• 320Gb Sata II
• 2 Gb DDR2 800mhz
• Asus 8800 GTS 640mb

Will this be enough to say run Crysis on High? Call of Duty 4 on High? Would there be any benefit to going for 2GB of DDR3 1066mhz RAM? Would the Thermaltake 430 W PSU keep all this running smoothly?