Really, I'd no idea about that^^^AFAIK-U cannot add a gfx card on a laptop l8er, it's soldered.
Thank u yogesh for ur suggestion . Here is the cpuz information of mainboard
manufacturer Dell
model 0U990C
chipset intel GM965 Rev C0
Southbridge intel 82801HBM(ICH8-ME)
LPCIO NS
plz reply as u read this