new gpu

probably could.

I use a 4850HD and it maxs all those games and then some, my PC runs those games at 60+ Fps with ease

though it depends on your screen size.
 
downgrading? how?

and 512MB Vram is plenty for your monitor. only need the 1GB for higher resolutions.
 
both cards you posted are DDR3


though the 4770 you first posted is DDR5, that dosnt count for much since it is got less streaming units.
and the 4770 is 128 bit and the 4850 is 256 bit.
 
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