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I was thinking about the upgrade to play dirt2 and Nfs shift at 1920*1080 on a 42''Is your system struggling in games?
If it is which games and at what res?
It maybe that a simple second hand 4890 would fulfil all your requirments without running the risk of a second hand MB and gfx card and the associated hassle that 'sometimes' accompanys that type of upgrade.
I was thinking about the upgrade to play dirt2 and Nfs shift at 1920*1080 on a 42''