aman22 :
i wanna buy a new graphics card
my pc configration is
core 2 duo E7400
4 gb ddr2 ram
pci express slot is X16
Plezzzzzz tell me a card so i can play bf3 ,the run,mw3 with ultra graphics at 1440X900
imo
your current configuration is not adequate to run those games at very high settings.
your psu is inadequate. looks like you have 14~ amps on your +12v rail. not enough (i can't verify that though, even after zooming SO HARD).
you're better off saving some money, buying at least a core i3 - i5 system with 4 gb ddr3 ram and a 500-650w 80+ psu, with a radeon hd 6850-6950 or nvidia gtx 560-570. or a ph ii x4/x6 with a 990fx/990x mobo with the same ram and gfx cards and psus.
for your current configuration, can't recommend a card higher than a radeon hd 6670 1gb gddr5, at most, a 6770 (you should really upgrade your psu first).