as the title suggests. Please tell me which is better. I can go for only one of these two and I will not choose an ATI card. I personally want the GTS 450 DDR 3 coz its smaller and GTS 450 is obviously better than GT 440 but Since GT 440 has DDR 5 i am confused. Both cards have both variants, but GT 440 ddr 3 is non sense and GTS 450 DDR5 is a bit big and slightly costs more.
If you want a low end economy card (no such thing any more) then I suggest that you look at ATI at least they run cooler and waste less power but a gts450 will get you a lot further than any GT430/440 ever could. If you want to save a little you can roll the dice on the second hand market but not always worth and have been ripped off before.
6850 or a gtx550ti. Power wise both cards are not complete hogs but 400w generic psu won't cut it.