Hmm , Im getting a new computer , and I need some help .

[Agent]

Here is my last choise , I hope its good , what do you guys says about it ?! ... Please mature comments .
This is important for me ...
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Intel Core 2 Quad Q9550 2.83GHz 12Mb 1333MHz BOX,

Gigabyte GA-EP45DS3 P45 Chipset,

G.skill DDR2 4096MB 1100MHZ PI CL5-5-5-15,

ASUS ATI Radeon HD4870 1GB DDR5 PCIe,

OCZ Vendetta CPU Cooler,

Samsung HD322HJ 320GB SATA II 16MB,

Auzentech X-Tension DIN,

NZXT Tempest "AirFlow King" No PSU,

Cooler Master 600W Silent Pro,
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Is this PC good enough to run the GTA IV on best graphics ? and SMOOTH

thx