Apparently not. You gave little to go on. Review your manual, if there's one item they cover well, is the type and class of ram required. -OR- visit their support website for these same details. Don't quibble, return the ram for proper replacement.
i already have a 512mb pc3200 in my pc then i bought a 512mb pc3200u thinking its a pc3200, when i install both at the same time, only 512mb was detected, is pc3200 and pc3200u not compatible?