Ohhhh. Thanks Piyush.
His monitor is 22" samsung(model no. don't know). Budget around 6-6.5K.
Confuse which to suggest him.
i guess his resolution is of 1920x1080 pixels
then he requires at least HD 5770 1gb @ 7.4k to play at that resolution
ask him to increase a bit
His current cabinet is of Circle. Any issue of cabinet?
And Gigabyte superb 460W will be sufficient for one of these...?
his PSU is pretty good and can easily handle HD 6850 too as vicky said
but if his cabinet is small, then he might have some problems
you need to check if his cabinet has enough space to put a med size card
HD 5770 is 21.9 X 12 X 4 cm (HxWxD)
so you get the idea?