I`m Also looking for this 2 Cards, and I`m confused about which would be a better card.. as far as I know if you need power GT 240 have more of it that GT 440, But as we all know GT 240 is Older so the features cannot be compared to the Newer GT440.
In my Opinion. you should first consider on what would you want you Graphics card to have,
newer and more feature with average power: GT440
or the Older but have a bit more power: GT240
and also, when comparing, we should consider that the 2 cards are on the same situation.
Example: both 1 gb
running on the same OS
running the same Application
with that you will be able to identify, watch for more about bench marks and hierarchy. we have that here on Tomshardware..