Oh, its a motherboard.
To determine what RAM u need, its best to know the mobo.
Chipset- Intel P35/G33/G31 , Rev-10
Southbridge- intel 8380 1gb (ICH7/R) Rev - A1
Brand Phoenix Technologies, LTD
And my motherboard is of ddr2 version. i have already inbuild 2gb ddr2 ram And in Cpuid software it is written that On SPD is,"Max Bandwith PC2-6400 (400 Mhz)"