basically i wanna play prototype 2, crysis 2-3,raiderz/tera f2p,kingdoms of amalur and maybe far cry 3. oh and skyrim. (k so just rpg/fps style rpgs really).but i have some q35 intel gma 3100 intergrated rubbish with an okay e8300 core 2 duo and 4gb ram in my dell optiplex 755 minitower . i dont need to play the game on max setting with all the pretty stuff just so its on and runs smoothly with good framerates. i found these three hd 6670, gt 640 and the gts 450 graphics cards but im not sure wich is the best(i think its the gts 450 then the gt 640). i also only have the standard dell 755 psu with combined 12a+12b equalling 264w i think with 18a on each, but it has no molex for the graphics card wich means i need the version of the gts with no six pin like the zotac eco, wich i understand was 'underclocked' for lower power consumption. so does the eco still beat the gt 640 gaming fps wise.
i couldnt find the requirements for the gts 450 just that it reccomends a 400w psu, i have 305w.