Help me deciding the tier of the graphic card.

the 4870 is around a 5770, which is slightly faster than the gt450. those reviews we're probably taken at launch, and the newer cards get a bit faster with newer driver releases.

thx alot guys... im having problem in deciding what kind of gfx should i buy since i really dont want to upgrade if the increasement is only 3-4 fps  ..., afterall latest bechmark always negates the old gen even if the benchmark is using low tier gfx

Best answer selected by beavermml.

For a worthwhile upgrade you'll want at least an HD6850 or GTX 460 1gb. At high resolutions they are approximately 40% faster than your HD4870 at stock speeds and both can usually overclock a very large amount on top of that(30%+).

yes and im considering HD6850 than gtx 4601gb... im afraid if i buy another AMD cards, i will be very pissed when opening an TWIMTBP titles game and some games really2 favor nvidia or have really poor optimzation towards AMD like in the case of NSF Shift..

which are better? or i really should wait a couple of months for next gpu release?

TWIMTBP only sometimes means the game will favor Nvidia cards. There are lot that don't actually. When you look at reviews there's always those games mixed in there anyway so overall benchmarks take the TWIMTBP games into account.

5770 is about the same as 4870

both are 14% faster than 450.