my pc takes ddr2 and ddr so screw u all maken me out to be sum sort of noobish newry Nyuck!
Firstly, some mobo's don't take all different types. Some only take all DDR, or all DDR2. If you have DDR2, more DDR2 would be best.
Secondly, different pin size usually means they are of different pysical size.
Thirdly, what PC/DDR/DDR2 type can your PC take? The sites list PC-3200 and PC6400, two entirely different types.
So, yeah, you are making yourself look like some sort of noobish Newry nyuck!