The GT 440 basically a GT 240 with a factory overclock in terms of gaming performance. That the card is 2gb is a bad thing as the extra memory is useless on such a card and a 2gb card is definitely DDR3. If your GT 240 is DDR5 then you are downgrading performance. The GT 440 is also usually a rather poor choice for the money compared to other cards you could buy.
Why don't you tell us you system specs and how much you are willing to spend rather than just asking about 1 card so we can give you real advice about what you actually should be buying.