Solution
how about radeon hd 7750 or 7770? 7770 has gotten enough price reductions to take radeon hd 6790's place.
if you can't wait to have a 6770 with vga and dvi ports then the 6750 will suffice.

BSNL

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can it give better performance in latest games ? my specs are intel core2duo E7400 @ 2.80 ghz and 2gb ram?screen resolution is 1366x768p
 

for latest games... your pc is kinda old. 2 gb system memory is marginal. 4 gb ram would have been better. cpu speed is also lacking, not to mention older architecture.
for 1366x768, radeon hd 6750 will be better than gt440.
do you know how much radeon hd 6770 costs at your location? if 6770 costs similar to 6750, then 6770 is the better choice.
 

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I went to buy 6770 but all the model has no vga/dvi ports. it has only 1 hdmi port on 6770 graphics card. but my monitor has no hdmi port. my monitor has only vga/dvi ports.
 

BSNL

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the shopkeeper told that 6770(with vga/dvi ports )will come after 2 months . i wait for 6770 for 2 months .its rather buying 6750 is better.