I need your advice upgrading HD 5770 or GTS 450?

dagasaitim

Distinguished
Jul 12, 2011
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I am ok with HD 5770? or GTS 450?

Specs
Intel e5200 2.50ghz
2gb ddr2
i play at 1280 by 1024
Corsair 500 watts

Games i played
COD MW
GTA 4 "MEDIUM TO LOW SETTING BECOZ OF MY CPU CANT HANDLE"
Prototype
Assasin brotherhood
NEED FOR SPEED mw and shift

Will my cpu bottleneck with my gpu? or i am okay :)